 Rhododendron, fir and maples near Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
 Forest below Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
 View from the top of 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.
 Rough Trail to Gray s Arch. Red River Gorge, Kentucky, November 5, 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.
 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.
 Rough Trail to Gray s Arch. Red River Gorge, Kentucky, November 5, 1999.
 View from the top of Gray s Arch at morning. 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.
 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.
 Rhododendron in a canyon, view from Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Blueberry and rhododendron bushes on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Sheltowee Trail. Red River Gorge, Kentucky, November 6, 1999.
 A.S. on Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 A.S. on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 A small maple on Rough Trail. Red River Gorge, Kentucky, November 6, 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.
 Flowers on a stone at Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 Pine forest on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 A tree with very big leaves on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 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.
 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.
 Erosion of a limestone rock at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 View of a canyon from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 Unknown dwarf berries on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Multicolor maple leaves on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Bottom of a canyon, view from Sheltowee Trail. Red River Gorge, Kentucky, November 6, 1999.
 A fungus (?) on a birch, 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.
 Limestone erosion forms at 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.
 Creeping fern among dry leaves and needles on Koomer Ridge Trail. Red River Gorge, Kentucky, November 7, 1999.
 Mushroom-like limestone erosion forms at Koomer Ridge Trail. Red River Gorge, Kentucky, November 7, 1999.
 Limestone rocks, view from Sheltowee Trail near Chimney Top Rock. 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.
 View of canyon walls at evening from Sheltowee Trail near Chimney Top Rock. 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.
 Tobacco farm near Slade, Kentucky, November 5, 1999.
 Steel arch bridge across Brazos River, view from Waco Suspension Bridge. Waco, Texas, November 22, 2009
 Postoffice Street in East End Historic District, with Rudolph Kruger House (1888) in foreground and ANICO (American National Insurance Company) Tower in foreground. Galveston, Texas, January 1, 2011
 Modern painting Triumphal Arch (1999) by Valeriy Lukka in Erarta Museum of Contemporary Art. Saint Petersburg, Russia, May 29, 2019
 View of Wabash River from a trail to Fort Ouiatenon. Indiana, November 13, 1999
 Potholes Park, Fall Creek Gorge. The trip was organized by Purdue University International Center. Near Pine Village, Indiana, June 5, 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.
 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.
 Overgrown section of Slavianka River, large leaves of butterbur in foreground in Pavlovsk Park. Pavlovsk, suburb of Saint Petersburg, Russia, July 31, 2024
 Entrance to Nahal Tseelim River Gorge, 2 miles north from Masada. The Middle East, January 20, 2001
 Stone arch of Ruins (1800-1803) near Slavyanka River one mile from Tiarlevo in Pavlovsk Park, suburb of Saint Petersburg. Russia, May 15, 2011
 Wabash Street Bridge across Chicago River. Sun-Times Daily News, Wrigley and Equitable Buildings are behind the bridge. Chicago, November 22, 1999
 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
 Dwarf purple rhododendron (Rhododendron impeditum) in Peter the Great Botanical Garden of Komarov Botanical Institute. Saint Petersburg, Russia, May 26, 2021
 Kamchatka rhododendron (Rhododendron camtschaticum) in Peter the Great Botanical Garden of Komarov Botanical Institute. Saint Petersburg, Russia, June 3, 2019
 Steel arch bridge spanning Brazos River (Washington Street Bridge, built in 1901), from south-west. Waco, Texas, August 23, 2008
 A wall of the gorge in Taughannock Falls State Park. New York, November 23, 2005
 State Street Bridge across Chicago River. City Garage (?) and Blue Cross - Blue Shield Building are behind the bridge. Chicago, November 22, 1999
 Stone Arch Bridge across Blackstone Canal in Blackstone River and Canal Heritage State Park. Uxbridge, Massachusetts, October 30, 2003
 Stone Arch Bridge across Blackstone Canal in Blackstone River and Canal Heritage State Park. Uxbridge, Massachusetts, October 30, 2004
 Stone Arch Bridge across Blackstone Canal in Blackstone River and Canal Heritage State Park. Uxbridge, Massachusetts, October 10, 2004
 Stone Arch Bridge across Blackstone Canal in Blackstone River and Canal Heritage State Park. Uxbridge, Massachusetts, October 30, 2003
 Cliffs of Enfield gorge in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
 Forest of Enfield gorge, from Rim Trail, in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
 Fallen sycamore tree in snow near Gorge Trail in Taughannock Falls State Park. New York, November 23, 2005
 Fall colors of Enfield gorge, view from Rim Trail, in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
 Tippecanoe River (after a drought) north from Lafayette, Indiana. September 18, 1999.
 Fall colors of Enfield gorge, zoomed, view from Rim Trail, in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
 Orange foliage of rhododendron in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, November 4, 2016
 Rhododendron leaves in snow in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, November 4, 2016
 Green and yellow leaves of rhododendron in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, November 4, 2016
 Davis Ferry Bridge across Wabash River north from Lafayette. Indiana, September 11, 1999.
 Moyka River south from Summer Garden. Saint Petersburg, Russia, April 13, 1999.
 Tippecanoe River north from Lafayette, Indiana. Shallow places appeared after a drought. September 18, 1999.
 View of Longfellow Bridge across Charles River from Hancock Tower in Boston. Massachusetts, August 3, 1999.
 Canoe trip on Tippecanoe River with international students of Purdue University. Indiana, September 18, 1999.
 Drying forest at Heritage Trail along Wabash River north from Lafayette. Indiana, September 11, 1999.
 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.
 Smol nyi Cathedral and monastery at a bend of Neva River in Saint Petersburg, Russia, April 21, 1999.
 Gulls on an embankment of Moyka River opposite to Summer Garden. Saint Petersburg, Russia, April 13, 1999.
 Moyka River and consulates of South-African Republic and France. Saint Petersburg, Russia, April 13, 1999.
 A trail along Wabash River at Ross Hills Park 5 miles west from Lafayette. Indiana, October 30, 1999.
 Forest along Wabash River in Ross Hills Park, 6 miles west from Lafayette, Indiana, September 25, 1999.
 A meadow near Wabash River at Ross Hills Park 5 miles west from Lafayette. Indiana, October 30, 1999.
 A sphinx on Egypt Bridge across Fontanka River at Lermontovsky Prospect. Saint Petersburg, Russia, April 22, 1999.
 Fallen sycamore near Wabash River at Ross Hills Park 5 miles west from Lafayette. Indiana, October 30, 1999.
 View of Longfellow Bridge across Charles River and Cambridge Pkwy. from Hancock Tower in Boston. Massachusetts, August 3, 1999.
 Ancient city of Firuzabad in south-western Iran built by Ardashir I (AD224-41), a founder of the Sasanian dynasty, on a fertile plane. Two huge double ramparts of clay form a perfect circle around the city, nearly 2 km in diameter. A modern city is behind it near a slope of Kuhe-Meimend Ridge. Rudhaneye-Hane-Begom River is in foreground. View from a window of a plane from Doha, Qatar to Houston, TX, March 16, 2010.
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