By Gabriel Helou | Jerusalem

By kevan hubbard | Hereford, England

By Nicholas Holshouser | Blue Ridge Parkway Milepost 425

By Kannan A | Singapore

By Kannan A | Singapore

By Kannan A | Singapore

By Kannan A | Singapore

By Ragini Chaturvedi | Colts Neck, NJ

By Ragini Chaturvedi | NJ, USA

By Meredith Gertz | Southern NH

By John Whitaker | Montgomery County, Maryland

By Frank Lu | Singapore

By Joel Weatherly | Edmonton, Alberta, Canada

By Jack Pope | Red River Gorge, Wolfe County, Kentucky

By Karl Diefenderfer | Lake Nockamixon State Park

By John Laing | Prague