Wall Street, the most picturesque section of the Narrows, Zion National Park, photographed October 2014.
Upper Yosemite Falls, Yosemite National Park, California. Photographed May 6, 2012.
Tatev Monastery, in the Syunik Province of Armenia, sits atop the sheer walls of a precipice. Photographed October 1, 2005.
