 Serpentine path of "Natural entrance" to Carlsbad Caverns. New Mexico, December 26, 2007
 Passage in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Limestone formations in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Flowstone feature in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Massive stalagmites in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 A column and other speleothems in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Narrow passage in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Limestone tunnel in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Pointed formations in caves of Carlsbad Caverns. New Mexico, December 26, 2007
 Stalactites and massive stalagmites in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Lions Tails hanging in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Travertine speleothems along a passage in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Massive stalagmites in Hall of Giants of Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Ocotillo bush near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
 Fresh snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
 Plants in snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
 Columns in a small side alcove in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Agaves and cacti in snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
 Huge stalagmite named "Rock of Ages" in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Irregularly shaped limestone formations along a passage of Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Bone-shaped limestone formations along a passage of Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Irregularly rounded- or scallop-shaped passages in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Stalactites and stalagmites in a small alcove along the side of Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Cholla cactus in snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
 A narrow stalagmite with a large cluster of stalactites in the Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Prickly pears cactus in snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
 Speleothems (including stalactites, stalagmites, a column, and helictites) in an alcove of the Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Drapery and ripple-shaped patterns of travertine flowstone speleothems in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
 Stalagmites in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
 The Watchtower in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
 A cave in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
 A hall in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
 Stalagmites in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
 Stalactites in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
 Spacious hall in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
 The King s Throne in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
 Pluto s Anteroom(?) in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
 Hall of the Mountain King(?) in Northern Cavern in Natural Bridge Caverns. San Antonio, Texas, October 6, 2007
 George Ashby s Phillips 66 gas station at crossing of Hwy 285 and FM 652. Orla, New Mexico, December 25, 2007
 Jackie and Hall Olds (Hal Old) store, grocery and cafe at crossing of Hwy 285 and FM 652. Orla, New Mexico, December 25, 2007
 A sign near Orla grocery near historical marker No. 3876 at crossing of Hwy 285 and FM 652. Orla, New Mexico, December 25, 2007
 Orla cafe served to feed workers in oil, gas, and sulphur fields, at crossing of Hwy 285 and FM 652. Orla, New Mexico, December 25, 2007
 Turkey Peak in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 24, 2007
 Passage between stones on Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 24, 2007
 Cacti on a slope of Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 24, 2007
 Sabinal River from East Trail in Lost Maples State Natural Area. Vanderpool, Texas, December 30, 2007
 Waterfall of Can Creek from West Trail in Lost Maples State Natural Area. Vanderpool, Texas, December 30, 2007
 Yucca on a hill west from entrance in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Agricultural emblem over the entrance of Civil Engineering Building on campus of Texas A and M University. College Station, Texas, December 19, 2007
 Horse skull statue at the entrance of Animal Industries Building on campus of Texas A and M University. College Station, Texas, December 19, 2007
 Sickle and rye emblem over the entrance of Scoates Hall (Agricultural education) on campus of Texas A and M University. College Station, Texas, December 19, 2007
 - Pecos Wilderness in New Mexico 8/30/97 (Dallas - a trip to New Mexico mountains, July 11 - August 30, 1997)
 - Pecos Wilderness in New Mexico 8/30/97 (Dallas - a trip to New Mexico mountains, July 11 - August 30, 1997)
 - Pecos Wilderness in New Mexico 8/30/97 (Dallas - a trip to New Mexico mountains, July 11 - August 30, 1997)
 - Pecos Wilderness in New Mexico 8/30/97 (Dallas - a trip to New Mexico mountains, July 11 - August 30, 1997)
 - Pecos Wilderness in New Mexico 8/30/97 (Dallas - a trip to New Mexico mountains, July 11 - August 30, 1997)
 - Pecos Wilderness in New Mexico 8/30/97 (Dallas - a trip to New Mexico mountains, July 11 - August 30, 1997)
 - Pecos Wilderness in New Mexico 8/30/97 (Dallas - a trip to New Mexico mountains, July 11 - August 30, 1997)
 - Pecos Wilderness in New Mexico 8/30/97 (Dallas - a trip to New Mexico mountains, July 11 - August 30, 1997)
 - Pecos Wilderness in New Mexico 8/30/97 (Dallas - a trip to New Mexico mountains, July 11 - August 30, 1997)
 A boardwalk in Cook Natural Area in fog. Princeton, New Jersey, March 23, 2007
 A marsh in Cook Natural Area at sunset. Kingston, New Jersey, April 2, 2007
 A marsh boardwalk in Cook Natural Area. Princeton, New Jersey, March 23, 2007
 A boardwalk in Cook Natural Area through a marsh in fog. Princeton, New Jersey, March 23, 2007
 Climbing Turkey Peak in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 A stone bridge (1937) across Heathcote Brook in Cook Natural Area. Kingston, New Jersey, April 28, 2007
 Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 A stone bridge across Heathcote Brook in Cook Natural Area at sunset. Kingston, New Jersey, April 2, 2007
 A deer on Linear Park Trail (former railroad) in Cook Natural Area, near Ridge Road. Kingston, New Jersey, May 11, 2007
 Weathering of rocks near Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Cacti east from Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Lichens on rocks near Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Weathered stones on a slope of Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Rocks east from Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Heathcote Farm (1857, a former State juvenile detention center, now Withington Estate) in Cook Natural Area. Kingston, New Jersey, May 11, 2007
 Prickly pear cactus on Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Entrance of the mall and Caesars Casino. Atlantic City, New Jersey, March 24, 2007
 Rocks on a slope of Freshman Mountain east from Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Entrance of Majolica Room in Hermitage museum. Saint Petersburg, Russia, August 14, 2007
 A creek near northern entrance of John Witherspoon Woods park. Princeton, New Jersey, April 28, 2007
 Entrance of Tukish Room from Mauritanian Parlor in Yusupov Palace. Saint Petersburg, Russia, September 6, 2007
 Nike Missiles at the entrance of Fort Hancock Historic District. Sandy Hook, New Jersey, March 11, 2007
 Pedestal rock (differential weathering) near Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Mushroom rocks (differential weathering of shaded sides of rocks) in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Skunk cabbage near a creek near northern entrance of John Witherspoon Woods park. Princeton, New Jersey, April 28, 2007
 A forest near Devil s Cave near northern entrance of John Witherspoon Woods park. Princeton, New Jersey, April 28, 2007
 Skunk cabbage along a creek near northern entrance of John Witherspoon Woods park. Princeton, New Jersey, April 28, 2007
 Leaves of skunk cabbage near a creek near northern entrance of John Witherspoon Woods park. Princeton, New Jersey, April 28, 2007
 Boulder field near Devil s Cave near northern entrance of John Witherspoon Woods park. Princeton, New Jersey, April 28, 2007
 Ethiopian hedgehog (Paraechinus aethiopicus) on a gardening glove at a short presentation of Qatar University for Qatar Natural History Group (QNHG) at the entrance of Rawdat Al Faras Research Station (RAFRS) near Al Zubara Road. Qatar, May 29, 2015
 Morning mist on boulder field near Stuart Road entrance of John Witherspoon Woods park. Princeton, New Jersey, April 28, 2007
 Opening leaves of skunk cabbage near a creek near northern entrance of John Witherspoon Woods park. Princeton, New Jersey, April 28, 2007
 View to the north from Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Weathered surface of Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Crass (product of weathering) on Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Standing on a granite dome of Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Sculpture atop of tumular tomb of Lodge No. 30, Benevolent and Protective Order of Elks, near the entrance of Greenwood Cemetery. New Orleans, Louisiana, January 9, 2007
 A lantern and a statue at the entrance of Frist Campus Center in Princeton University. Princeton, New Jersey, March 17, 2007
 Decoration over the entrance of Civil Engineering Building on campus of Texas A and M University. College Station, Texas, September 22, 2007
|