Blue Ice Cave, Antarctica, December 2011.

Arches National Park, UT

Medicine Lake in Glacier National Park

A small stream near Arrowtown, New Zealand

Little slice of Paradise. Lower Enchantment Lakes, Washington State.

Vera Falls of Malinao, Albay, Philippines

Marble Caves. Lake Bueno Aires, Chile

Alberta Mountains, Canada

Jewel Cave, Augusta, WA, Australia

Cirque de Gavarnie, Pyrenees

Hill fortress of Sigiriya, Sri Lanka

Inishmore, Ireland

The Matterhorn on a cold evening in October