![](../../pictures/archives/compress/2007/601/jpeg/05t.jpg) Stalagmites in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/601/jpeg/07t.jpg) A hall in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/601/jpeg/01t.jpg) A cave in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/601/jpeg/02t.jpg) The Watchtower in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/601/jpeg/06t.jpg) Stalactites in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/601/jpeg/04t.jpg) The King s Throne in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/601/jpeg/09t.jpg) Spacious hall in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/601/jpeg/10t.jpg) Pluto s Anteroom(?) in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/601/jpeg/08t.jpg) Hall of the Mountain King(?) in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/607/jpeg/26t.jpg) Massive stalagmites in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/608/jpeg/12t.jpg) Stalactites and massive stalagmites in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/608/jpeg/04t.jpg) Massive stalagmites in Hall of Giants of Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/608/jpeg/06t.jpg) Stalactites and stalagmites in a small alcove along the side of Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/607/jpeg/19t.jpg) Speleothems (including stalactites, stalagmites, a column, and helictites) in an alcove of the Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/601/jpeg/16t.jpg) River Walk underneath a bridge. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/608/jpeg/09t.jpg) "Natural entrance" to Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/608/jpeg/10t.jpg) Serpentine path of "Natural entrance" to Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/601/jpeg/11t.jpg) Mission San Juan. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2008/680/jpeg/15t.jpg) Riverwalk passage under a bridge. San Antonio, Texas, October 24, 2008
![](../../pictures/archives/compress/2007/601/jpeg/13t.jpg) Statue near Mission San Juan. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/601/jpeg/12t.jpg) A church of Mission San Juan. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/601/jpeg/14t.jpg) Church of Mission Espada. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2007/601/jpeg/15t.jpg) Mall near River Walk. San Antonio, Texas, October 6, 2007
![](../../pictures/archives/compress/2008/680/jpeg/20t.jpg) Riverwalk at evening, view from a foot bridge. San Antonio, Texas, October 24, 2008
![](../../pictures/archives/compress/2007/581/jpeg/05t.jpg) A stone bridge (1937) across Heathcote Brook in Cook Natural Area. Kingston, New Jersey, April 28, 2007
![](../../pictures/archives/compress/2007/577/jpeg/21t.jpg) A stone bridge across Heathcote Brook in Cook Natural Area at sunset. Kingston, New Jersey, April 2, 2007
![](../../pictures/archives/compress/2008/616/jpeg/07t.jpg) River Walk under E. Houston(?) Street Bridge. San Antonio, Texas, February 9, 2008
![](../../pictures/archives/compress/2007/607/jpeg/23t.jpg) Passage in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2008/616/jpeg/09t.jpg) Bench at River Walk under E. Pecan(?) Street Bridge. San Antonio, Texas, February 9, 2008
![](../../pictures/archives/compress/2007/608/jpeg/01t.jpg) Flowstone feature in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/607/jpeg/22t.jpg) Pointed formations in caves of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/608/jpeg/02t.jpg) Limestone formations in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/607/jpeg/24t.jpg) Limestone tunnel in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/607/jpeg/25t.jpg) Narrow passage in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/608/jpeg/13t.jpg) A column and other speleothems in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/602/jpeg/10t.jpg) Climbing Turkey Peak in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/601/jpeg/25t.jpg) Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/607/jpeg/20t.jpg) Travertine speleothems along a passage in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/608/jpeg/11t.jpg) Lions Tails hanging in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/602/jpeg/14t.jpg) Cacti east from Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/601/jpeg/24t.jpg) Weathering of rocks near Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/602/jpeg/12t.jpg) Weathered stones on a slope of Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/602/jpeg/13t.jpg) Rocks east from Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/602/jpeg/04t.jpg) Lichens on rocks near Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/607/jpeg/14t.jpg) Fresh snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/607/jpeg/15t.jpg) Plants in snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/607/jpeg/11t.jpg) Ocotillo bush near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/608/jpeg/14t.jpg) Columns in a small side alcove in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/602/jpeg/02t.jpg) Prickly pear cactus on Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/608/jpeg/03t.jpg) Huge stalagmite named "Rock of Ages" in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/607/jpeg/21t.jpg) A narrow stalagmite with a large cluster of stalactites in the Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/608/jpeg/08t.jpg) Bone-shaped limestone formations along a passage of Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/607/jpeg/18t.jpg) Irregularly rounded- or scallop-shaped passages in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/607/jpeg/16t.jpg) Agaves and cacti in snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/607/jpeg/12t.jpg) Cholla cactus in snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/608/jpeg/07t.jpg) Irregularly shaped limestone formations along a passage of Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/607/jpeg/13t.jpg) Prickly pears cactus in snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/602/jpeg/11t.jpg) Rocks on a slope of Freshman Mountain east from Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/608/jpeg/05t.jpg) Drapery and ripple-shaped patterns of travertine flowstone speleothems in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
![](../../pictures/archives/compress/2007/601/jpeg/26t.jpg) Pedestal rock (differential weathering) near Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/602/jpeg/09t.jpg) Mushroom rocks (differential weathering of shaded sides of rocks) in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/579/jpeg/01t.jpg) A historical bridge across Millstone River bridge during flooding, near Road 27. Kingston, New Jersey, April 16, 2007
![](../../pictures/archives/compress/2007/602/jpeg/07t.jpg) Weathered surface of Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/602/jpeg/06t.jpg) View to the north from Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/602/jpeg/05t.jpg) Crass (product of weathering) on Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2007/602/jpeg/08t.jpg) Standing on a granite dome of Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
![](../../pictures/archives/compress/2008/680/jpeg/19t.jpg) Riverwalk at evening. San Antonio, Texas, October 24, 2008
![](../../pictures/archives/compress/2008/680/jpeg/16t.jpg) Alamo mission. San Antonio, Texas, October 24, 2008
![](../../pictures/archives/compress/2007/564/jpeg/23t.jpg) Veterans Memorial Bridge, also known as Gramercy Bridge, over Mississippi River. Fog is the result of cooling of warm and humid air. Wallace, west from New Orleans, Louisiana, January 7, 2007
![](../../pictures/archives/compress/2008/680/jpeg/18t.jpg) Restaurant in area of Navarro Street at Riverwalk at evening. San Antonio, Texas, October 24, 2008
![](../../pictures/archives/compress/2007/564/jpeg/24t.jpg) Veterans Memorial Bridge, also known as Gramercy Bridge, over Mississippi River, view from a levee near River Road. Wallace, Louisiana, January 7, 2007
![](../../pictures/archives/compress/2007/575/jpeg/25t.jpg) A boardwalk in Cook Natural Area in fog. Princeton, New Jersey, March 23, 2007
![](../../pictures/archives/compress/2008/680/jpeg/17t.jpg) Hotel Valencia and a high-rise building in area of Navarro Street, view from Riverwalk. San Antonio, Texas, October 24, 2008
![](../../pictures/archives/compress/2007/575/jpeg/26t.jpg) A boardwalk in Cook Natural Area through a marsh in fog. Princeton, New Jersey, March 23, 2007
![](../../pictures/archives/compress/2007/575/jpeg/24t.jpg) A marsh boardwalk in Cook Natural Area. Princeton, New Jersey, March 23, 2007
![](../../pictures/archives/compress/2007/577/jpeg/20t.jpg) A marsh in Cook Natural Area at sunset. Kingston, New Jersey, April 2, 2007
![](../../pictures/archives/compress/2007/607/jpeg/06t.jpg) Turkey Peak in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 24, 2007
![](../../pictures/archives/compress/2007/610/jpeg/20t.jpg) Waterfall of Can Creek from West Trail in Lost Maples State Natural Area. Vanderpool, Texas, December 30, 2007
![](../../pictures/archives/compress/2007/607/jpeg/05t.jpg) Passage between stones on Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 24, 2007
![](../../pictures/archives/compress/2007/610/jpeg/19t.jpg) Sabinal River from East Trail in Lost Maples State Natural Area. Vanderpool, Texas, December 30, 2007
![](../../pictures/archives/compress/2007/607/jpeg/04t.jpg) Cacti on a slope of Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 24, 2007
![](../../pictures/archives/compress/2007/584/jpeg/09t.jpg) A deer on Linear Park Trail (former railroad) in Cook Natural Area, near Ridge Road. Kingston, New Jersey, May 11, 2007
![](../../pictures/archives/compress/2007/584/jpeg/10t.jpg) Heathcote Farm (1857, a former State juvenile detention center, now Withington Estate) in Cook Natural Area. Kingston, New Jersey, May 11, 2007
![](../../pictures/archives/compress/2016/1922/jpeg/25t.jpg) Smaller Chinese Bridge and Cross Bridge (Krestovy Most) in Alexander Park. Pushkin (former Tsarskoe Selo), south from Saint Petersburg, Russia, October 3, 2016
![](../../pictures/archives/compress/2005/468/jpeg/03t.jpg) City sewage waterfall in Cascadilla gorge, view from a stone foot bridge below and east from Stewart Avenue bridge. Ithaca, New York, October 10, 2005
![](../../pictures/archives/compress/2007/569/jpeg/26t.jpg) View from Brooklyn Bridge. New York City, February 18, 2007
![](../../pictures/archives/compress/2008/685/jpeg/14t.jpg) Rocks, a pond and a foot bridge of Maple Trail, view from East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
![](../../pictures/archives/compress/2007/594/jpeg/19t.jpg) Fontanka River near Anichkov Bridge. Saint Petersburg, Russia, August 27, 2007
![](../../pictures/archives/compress/2007/586/jpeg/13t.jpg) Iron Bridge Trail in Lick Creek Park. College Station, Texas, May 26, 2007
![](../../pictures/archives/compress/2007/582/jpeg/17t.jpg) Rowing in Carnegie Lake, view from Washington Road bridge. Princeton, New Jersey, May 2, 2007
![](../../pictures/archives/compress/2007/568/jpeg/23t.jpg) Lake Carnegie, view from Washington Road bridge. Princeton, New Jersey, February 4, 2007
![](../../pictures/archives/compress/2007/569/jpeg/22t.jpg) A sleeping place under a bridge near Bowery Street in Chinatown. New York City, February 18, 2007
![](../../pictures/archives/compress/2007/603/jpeg/07t.jpg) Bridge of Deer Run Trail in fog in Lick Creek Park. College Station, Texas, November 5, 2007
![](../../pictures/archives/compress/2007/595/jpeg/23t.jpg) Pil Tower and a bridge of Slavianka River. Pavlovsk, a suburb of Saint Petersburg, Russia, August 29, 2007
![](../../pictures/archives/compress/2007/568/jpeg/24t.jpg) Lake Carnegie at sunset, view from Washington Road bridge. Princeton, New Jersey, February 4, 2007
![](../../pictures/archives/compress/2007/567/jpeg/09t.jpg) Deer Run Trail near the bridge in Lick Creek Park after ice storm. College Station, Texas, January 17, 2007
![](../../pictures/archives/compress/2007/567/jpeg/02t.jpg) Iron Bridge Trail in Lick Creek Park after ice storm. College Station, Texas, January 17, 2007
![](../../pictures/archives/compress/2007/576/jpeg/21t.jpg) A suspension bridge across Stony Brook in the park of Institute for Advanced Studies. Princeton, New Jersey, March 29, 2007
![](../../pictures/archives/compress/2007/582/jpeg/19t.jpg) A path in Delaware and Raritan Canal State Park, near Washington Road bridge. Princeton, New Jersey, May 3, 2007
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