 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 Oak forest near Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 Rhododendron in a canyon, view from Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Bottom of a canyon, view from Sheltowee Trail. Red River Gorge, Kentucky, November 6, 1999.
 View of canyon walls at evening from Sheltowee Trail near Chimney Top Rock. Red River Gorge, Kentucky, November 6, 1999.
 Bamboo brushes on the bottom of a canyon near Sheltowee Trail. Red River Gorge, Kentucky, November 6, 1999.
 View from Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Limestone rocks, view from Sheltowee Trail near Chimney Top Rock. Red River Gorge, Kentucky, November 6, 1999.
 View from the top of Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 View from the top of Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Gray s Arch, view from rock shelters. Red River Gorge, Kentucky, November 6, 1999.
 Gray s Arch, view from rock shelters. Red River Gorge, Kentucky, November 6, 1999.
 View of rock shelters from the top of Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
 Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 A.S. on Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 A.S. on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Sheltowee Trail. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 A small maple on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Pine forest on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Sheltowee Trail near Chimney Top Rock. Red River Gorge, Kentucky, November 6, 1999.
 Mushrooms in moss at Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 Rough Trail to Gray s Arch. Red River Gorge, Kentucky, November 5, 1999.
 Rough Trail to Gray s Arch. Red River Gorge, Kentucky, November 5, 1999.
 Flowers on a stone at Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 A tree with very big leaves on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Multicolor maple leaves on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Blueberry and rhododendron bushes on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Erosion of a limestone rock at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Unknown dwarf berries on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Limestone erosion forms at Koomer Ridge Trail. Red River Gorge, Kentucky, November 7, 1999.
 A fungus (?) on a birch, Sheltowee Trail near Chimney Top Rock. Red River Gorge, Kentucky, November 6, 1999.
 Mushroom-like limestone erosion forms at Koomer Ridge Trail. Red River Gorge, Kentucky, November 7, 1999.
 Creeping fern among dry leaves and needles on Koomer Ridge Trail. Red River Gorge, Kentucky, November 7, 1999.
 Erosion forms of limestone in a rock shelter at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Erosion forms of limestone on a rock shelter at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Tree roots and erosion forms on a limestone rock at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Forest below Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
 Gray s Arch with rhododendron on foreground. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Rhododendron, fir and maples near Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Erosion of limestone near Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 View of Wabash River from a trail to Fort Ouiatenon. Indiana, November 13, 1999
 Tobacco farm near Slade, Kentucky, November 5, 1999.
 Canyon of Yellowstone River from Grand View Lookout Point in Canyon Village. Yellowstone Park, Wyoming, July 24, 2010
 Fall colors of Enfield gorge, view from Rim Trail, in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
 Fall colors of Enfield gorge, zoomed, view from Rim Trail, in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
 View of canyon of Nahal Keziv river from trail 2223, 2 miles north-west from Mi ilia. Galilee, the Middle East, March 31, 2002
 A river flowing in a canyon with birches and pines at Karelia Isthmus between Lembolovo and Orekhovo (a popular place for hiking and skiing), 30 miles north from Saint Petersburg. Russia, April 19, 1999.
 View from trail 2223 overlooking canyon of Nahal Keziv river, 2 miles north-west from Mi ilia. Galilee, the Middle East, March 31, 2002
 A.S. at entrance to Nahal Tseelim River Gorge from Dead Sea, 2 miles north from Masada, view from a parking place. The Middle East, January 20, 2001
 Entrance to Nahal Tseelim River Gorge from Dead Sea, 2 miles north from Masada, view from a parking place. The Middle East, January 20, 2001
 View of a cave from trail 2223 overlooking canyon of Nahal Keziv river, 2 miles north-west from Mi ilia. Galilee, the Middle East, March 31, 2002
 Rocks along Missouri River, view from Kathy Trail near Columbia, Missouri. October 23, 1999.
 Bushes on rocks along Missouri River, view from Kathy Trail near Columbia, Missouri. October 23, 1999.
 Rocks and bushes along Missouri River, view from Kathy Trail near Columbia, Missouri. October 23, 1999.
 Boot Rock, view from Juniper Canyon Trail. Big Bend National Park, Texas, November 23, 2007
 Northeast Rim, view from lower part of Juniper Canyon Trail. Big Bend National Park, Texas, November 23, 2007
 Crown Mountain, view from lower part of Juniper Canyon Trail. Big Bend National Park, Texas, November 23, 2007
 Tight cluster of Ringless honey mushrooms (Desarmillaria caespitosa, former D. tabescens) on Richards Loop Trail in Sam Houston National Forest. Texas, November 5, 2020
 View of Charles River and downtown Boston from the top of Bunker Hill Monument. Massachusetts, July 31, 1999.
 View of Back Bay, Charles River and Cambridge from Hancock Tower in Boston. Massachusetts, August 3, 1999.
 View of Longfellow Bridge across Charles River from Hancock Tower in Boston. Massachusetts, August 3, 1999.
 View of Longfellow Bridge across Charles River and Cambridge Pkwy. from Hancock Tower in Boston. Massachusetts, August 3, 1999.
 View of a giant dry waterfall at the end of the canyon from the southern side of the Bokek creek canyon. The Middle East, February 22, 2001
 Yellowstone River, eastern view from a lookout in Canyon Village. Yellowstone Park, Wyoming, July 24, 2010
 Yellowstone River, view to the east from a lookout in Canyon Village. Yellowstone Park, Wyoming, July 24, 2010
 Yellowstone River from Grand View Lookout Point in Canyon Village. Yellowstone Park, Wyoming, July 24, 2010
 View of New Old South Church (bottom of the picture), Back Bay and Charles River from Hancock Tower in Boston. Massachusetts, August 3, 1999.
 Canyon of Yellowstone River from a lookout in Canyon Village. Yellowstone Park, Wyoming, July 24, 2010
 Lower Falls of Yellowstone River from Grand View Lookout Point in Canyon Village. Yellowstone Park, Wyoming, July 24, 2010
 A building at Columbus Drive, view from Chicago River. Chicago, October 12, 1999.
 Wrigley Building and NBC Tower, view from Chicago River. Chicago, October 12, 1999.
 Sears Tower and neighbor buildings, view from Chicago River. Chicago, October 12, 1999.
 Potholes Park, Fall Creek Gorge. The trip was organized by Purdue University International Center. Near Pine Village, Indiana, June 5, 1999.
 View of Cambridge and Boston from Harvard Bridge across Charles River in Boston. Massachusetts, August 3, 1999.
 View from Chicago River. Chicago, October 12, 1999.
 View of typical Chicago houses from Amtrak train, November 22, 1999
 Overcoming a tub in a creek in Potholes Park (Fall Creek Gorge) by an international student of Purdue University. Near Pine Village, Indiana, June 5, 1999.
 Inspecting a creek in Potholes Park (Fall Creek Gorge) by international students of Purdue University. Near Pine Village, Indiana, June 5, 1999.
 Forest of Enfield gorge, from Rim Trail, in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
 International students of Purdue University walking over rapids and tubs of a creek in Potholes Park (Fall Creek Gorge) near Pine Village. Indiana, June 5, 1999.
 Chicago Tribune Tower, view from Chicago River. Chicago, October 12, 1999.
 Fallen sycamore tree in snow near Gorge Trail in Taughannock Falls State Park. New York, November 23, 2005
 A tree in fog near Slocums River, view from Slocums River Reserve. Dartmouth, Massachusetts, November 25, 2004
 View of Troitsky Bridge from Suvorovskaya Square. It is similar to Alexander III Bridge in Paris. Blue dome of a mosque is seen at the opposite bank of Neva River. Saint Petersburg, Russia, April 13, 1999.
 View of the opposite side of the canyon and Ein Bokek at Dead Sea from the southern side of the Bokek creek canyon. The Middle East, February 22, 2001
 Entrance to Nahal Tseelim River Gorge, 2 miles north from Masada. The Middle East, January 20, 2001
 View of Kresty prison from Robespyera Embankment of Neva River. Two buildings have a shape of crosses (kresty mean crosses in Russian). Saint Petersburg, Russia, April 21, 1999.
 Drying forest at Heritage Trail along Wabash River north from Lafayette. Indiana, September 11, 1999.
 View of a beaver s pond from a beaver s damn across Burnett Creek. Indiana, November 26, 1999
 A trail along Wabash River at Ross Hills Park 5 miles west from Lafayette. Indiana, October 30, 1999.
 Flowers along trail 2223 overlooking canyon of Nahal Keziv river, 2 miles north-west from Mi ilia. Galilee, the Middle East, March 31, 2002
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