Praia da Adraga beach, Portugal -

Dean's Blue Hole, Long Island, Bahamas.

Great Sand Dunes National Park and Preserve

Dragon Blood Tree, Socotra, Yemen

Santorini, Greece

Erosion on the slopes of a volcano near Ankisabe, Madagascar

The California Coast

Natural terrace pool, Pamukkale, Turkey.

Gouffre de Padirac - France

Upper Trail Lake in Moose Pass, Alaska

Luoping, Yunnan Province, China

Grand Prismatic Spring, Yellowstone NP, USA

Frasier Lake, Bozeman Montana