Kirkendall-Spring / Soda Butte with starry nights sky, Yellowstone National Park, Wyoming, USA, June 2013.

David Welling / Dried grasses and red rock geological formations along the Smithsonian Butte National Scenic byway. Southern Utah, USA, July.

Tim Fitzharris / Stand of conifers in the Elk Mountains near Crested Butte, Colorado

Tim Fitzharris / The Mittens and Merrick Butte at sunrise, Monument Valley, Arizona

Tim Fitzharris / East and West Mittens, buttes with rippled sand, Monument Valley, Arizona

Jack Dykinga / Ponderosa pines {Pinus ponderosa}, Promontory Butte on General George Crook Trail along the Mogollon Rim, Apache Sitgreaves National Forest, Arizona, USA

Yva Momatiuk & John Eastcott / Lone hiker walking along the base of a sandstone butte strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Lone hiker walking along the base of a sandstone butte strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Tim Fitzharris / Startrails over Shiprock in four corners region, New Mexico

Graham Eaton / The Carboniferous age Limestone escaprpment of Warrendale Knotts near Settle, North Yorkshire, UK, October

Jack Dykinga / Yellow California goldfields (Lasthenia californica) and orange California poppies (Eschscholzia californica), with lupins intermixed. Antelope Butte, near the Antelope Valley California Poppy Reserve...

Jack Dykinga / Yellow California goldfields (Lasthenia californica) and orange California poppies (Eschscholzia californica), with lupins intermixed. Antelope Butte, near the Antelope Valley California Poppy Reserve...