The extinct caldera of Ukhtasar, at an elevation of 3200 m (10,500 ft), is home to hundreds of Stone Age petroglyphs. Photographed July 2017, Syunik Province, Armenia.
Arches National Park, Utah. Photographed June 2012.
Pine Creek Canyon lights up with the first rays of the Sun. Photographed April 12, 2014, Zion National Park, Utah.
