Kirkendall-Spring / Trees and sea stacks silhouetted in fog at Point of the Arches in Olympic National Park. Washington, USA, August 2012.

Shattil & Rozinski / Rock arch viewed through fog in winter, Arches National Park, Utah, USA, 1992

David Welling / Rock arch in Colorado plateau. Arches NP, Utah, Turret Arch

Jeff Foott / Park Avenue view, Arches National Park, Utah

Jeff Foott / Tower Arch, Arches National Park, Utah

Jeff Foott / Double Arch seen through Cove Arch, Arches National Park, Utah

Jeff Foott / Full moon over Balanced Rock formation, Arches National Park, Utah

Jeff Foott / Turret Arch in winter, La Sal Mountains, Arches National Park, Utah

Jeff Foott / Turret Arch and the Milky Way, Arches National Park, Utah

Jeff Foott / Mule-ears (Wyethia amplexicaulis) flowers at the The Organ, Arches National Park, Utah

Jeff Foott / Marching Men sandstone formation, Arches National Park, Utah

Jeff Foott / Delicate Arch and the La Sal Mountains, Arches National Park, Utah

Jeff Foott / Paintbrush (Castilleja sp) flowers, Arches National Park, Utah

Jeff Foott / Winding road and sandstone formations, La Sal Mountains, Arches National Park, Utah

Jeff Foott / Sandstone rock formations, La Sal Mountains, Arches National Park, Utah

Jeff Foott / Collared Lizard (Crotaphytus collaris) male basking, Arches National Park, Utah

Tim Fitzharris / The Windows Section from Double Arch at sunrise, Arches National Park, Utah

Tim Fitzharris / The Windows Section from Double Arch at sunrise, Arches National Park, Utah

Jeff Foott / Milky way over arch, Turret Arch, Arches National Park, Utah

Gerry Ellis / Delicate Arch, Arches National Park, Utah

Gerry Ellis / Upward view of Delicate Arch, Arches National Park, Utah

Tim Fitzharris / Paintbrush (Castilleja sp) and the Organ Rock, Arches National Park, Utah

Tim Fitzharris / Plains Pricklypear (Opuntia polyacantha), Arches National Park, Utah

Tim Fitzharris / Turret arch through north window arch, Arches National Park, Utah

Enrique Lopez-Tapia / Rock arch on coast. Twelve Apostles, Port Campbell National Park, Great Ocean Road, Victoria, Australia. September 2009.

Jeff Foott / Hickman Bridge, rock arch in Navajo sandstone. Capitol Reef National Park, Utah, USA. February 2020.

Jeff Foott / Hickman Bridge, rock arch in Navajo sandstone. Capitol Reef National Park, Utah, USA. February 2020.

Jeff Foott / Common collared lizard (Crotaphytus collaris auriceps) male basking on rock. Arches National Park, Utah, USA. May.

Jeff Foott / Common collared lizard (Crotaphytus collaris auriceps) male basking on rock. Arches National Park, Utah, USA. May.

Jeff Foott / Common collared lizard (Crotaphytus collaris auriceps) male basking on rock. Arches National Park, Utah, USA. May.

Jeff Foott / Common collared lizard (Crotaphytus collaris auriceps) male basking on rock. Arches National Park, Utah, USA. May.

Jeff Foott / Common collared lizard (Crotaphytus collaris auriceps) male basking on rock. Arches National Park, Utah, USA. May.

Jeff Foott / Common collared lizard (Crotaphytus collaris auriceps) male basking on rock. Arches National Park, Utah, USA. May.

Jeff Foott / Common collared lizard (Crotaphytus collaris auriceps) male basking on rock. Arches National Park, Utah, USA. May.

Jeff Vanuga / Moonrise over the Fins in Arches National Park, Utah, USA. Novemer.

Bert Willaert / Nature's Window rock arch, with view to Murchison River in valley below. Kalbarri National Park, Western Australia. October 2019.

Philippe Clement / Tre Cime di Lavaredo / Drei Zinnen, three distinctive mountain peaks in the Sexten Dolomites seen from WW1 cave shelter, South Tyrol, Italy, October 2019

Juan Carlos Munoz / Climber on top of Owl Rock, Garden of Eden, Arches National Park, Colorado Plateau, Moab, Utah, USA. October 2016.

Juan Carlos Munoz / Wolfe Ranch petroglyphs under the Milky Way, Arches National Park, Colorado Plateau, Moab, Grand County, Utah, USA. October 2016.

Juan Carlos Munoz / Delicate Arch, Arches National Park, Colorado Plateau, Utah, Grand County, USA. October 2016.

Kirkendall-Spring / Holei Sea Arch on the edge of the Kupaianaha Lava Shield, Hawaii Volcanoes National Park, Hawaii. December 2016.

Jurgen Freund / The Window, Bungle Bungle Range, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia. June 2016.

Jurgen Freund / The Window, Bungle Bungle Range, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia. June 2016.

Jurgen Freund / The Window, Bungle Bungle Range, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia. June 2016.

Phil Savoie / Milky way seen through ruined archway of Llanthony Priory. Brecon Beacons National Park, Monmouthshire, Wales, UK, August 2017.

David Noton / Murchison River gorge from Natures Window, Kalbarri National Park, Western Australia, December 2015.

Jack Dykinga / Sunset Arch at dawn. Grand Staircase-Escalante National Monument, USA, October.

Inaki Relanzon / Ute tribal petrogliphs on a rock illustrating Bighorn sheep, Arches National Park, Utah, USA.