Natural limestone structures at Nambung National Park, Western Australia

Aconcagua, Argentina

The colourful sandstone formations at White Pocket, AZ

Stunning pic of Monument Valley. (does anyone know how this was formed?)

Delicate Arch, Arches Nation Park

Kings Canyon National Park, California

Double Rainbow near the Isles of Skye, Scotland

Devil's Tower, WY

Desolation Wilderness, Sierra Nevada, CA

Northern lights over Sarkofagen, Svalbard, Norway - Autumn 2011

Loch Lomond, Scotland

One of the several waterfalls along the Carthew-Alderson hike in Waterton Lakes, AB

Seventy Islands, Palau