Grand Canyon, Arizona

Rock formation in Moab, Grand Canyon, Utah

Tufas at Lake Mono, California

Marble Caves. Lake Bueno Aires, Chile

Fremont, California

Iran countryside

Klyuchevskaya Sopka Stratovolcano in Kamchatka, Russia

Black's Beach from the top of the cliffs, San Diego, CA

Piercy Island, Bay of Islands, New Zealand

Washington Pass

Turquoise ice at Lake Baikal, by Alexey Trofimov

Everest against the Milky Way

Sierra Nevada, California