Olympic National Park, Washington

Gouffre de Padirac - France

Epirus, Greece

El sótano de las golondrinas, San Luis Potosí, México

Prusik Peak, WA

Lewis River - Lower Falls

Richat Structure (Eye of the Sahara)

Eagle Lake, near Lake Tahoe, California

Caribbean

Mesa Arch, Canyonlands National Park - Moab Utah

Devils Tower - Devils Tower, Wyoming

Woodlands on the Southern California Coast

Rock formation in Moab, Grand Canyon, Utah