Dean's Blue Hole, Long Island, Bahamas.

Cougar Mountain, Washington

Durdle Door, Jurassic Coast

Grand Teton Range

Old Man's Cave - Hocking Hills, Ohio

Crimean night

Southern China

Frasier Lake, Bozeman Montana

A view from Cathedral Rock, Sedona, Arizona

Lake Baikal, Russia

Aconcagua, Argentina

Richat Structure (Eye of the Sahara)

The coastline of Lake Urmia, in Iran.