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Inside a lava tube in Craters of the Moon National Monument and Preserve in Idaho
Various valleys and gullies of water at the bottom of Lake Cerkniška in Slovenia. The lake thus dries up and flows into underground rivers approximately every 50 years.
Gran Canaria, landscape of steep eroded north west coast between Galdar and Agaete municipalities, hike between \nvillages Sardina del Norte and Puerto de Las Nieves, aboriginal cave Cueva del Moro
Kelso, United States - January 31, 2015:  The sign at the northern perimeter of the Mojave National Preserve located near Kelso, California in the eastern portion of San Bernadino County.
Mojave Desert At San Bernardino In California United States. National Reserve Tourism Travel. Famous California Desert. Mojave Desert At San Bernardino In California United States.
Mother's Day - Mother and Daughter Outdoors Afternoon Desert Trail Hike In Rural Western Colorado Outdoors on a Spring Afternoon - Sun High Mid afternoon and focal variations - images down-sampled for clarity as needed (photos professionally retouched and filters applied as needed - Lightroom / Photoshop - original size 8688 x 5792 canon 5DS Full Frame) iStock Portfolio: http://bit.ly/eyecrave_istock Getty Images Portfolio: http://bit.ly/eyecrave_getty
Erosion in the Mojave desert landscape in California United States
Hercules Leg Cave at Lava Beds National Monument in California, USA.
Oasis of Roger Spring has waterfalls, cave and Pictures of Airplane in the Sky
Scenery at Valley of Fire Recreation Area, New Mexico, USA
Entrance to the Sentinel Cave in Lava Beds National Monument in California
Female hiker standing among rock formations in the Hall of Horrors in Joshua Tree National Park, California
Snow Canyon State ParkSnow Canyon State Park
View of a Salt Mine Cave next to the Salt formations in Garmsar of Iran
The Spoeg river (Spit River) Caves are of archaeological importance as they contain the earliest evidence of sheep in Southern Africa dating back about 2000 years.
Entrance of an old cave in Frasassi natural park
Lanzarote, Spain: lava tube with climbing tops
Scenery at Valley of Fire Recreation Area, New Mexico, USA
Deposits of the Taung Skull were blasted by lime workers from tufa deposits and Raymond Dart reconstructed sections of the skull in 1924. He identified them as  Australopithecus africanus, the first discovery of its kind. The site is part of the UNESCO Cradle of Humankind World Heritage Site. Shot at the Taung Skull Fossil Site at the Buxton Limeworks, in the Taung district of North West Province of South Africa.
Colapsed lava tube with a light covering of snow on the rocks in the shade at El Malpais National Monument, New Mexico, United States.
Image of Abandoned mine in desert of Death Valley with shaft entrance
Lava Tubes are collapsing around the Queen's Bath area of Hawaii.
Archaeological complex \
Catacombs Cave entrance at Lava Beds National Monument in California, USA.
View of the interior of the Guitarreros Cave located in the district of Shupluy, Yungay, Ancash - Peru.
Scenery at Valley of Fire Recreation Area, New Mexico, USA
Lava Beds National Monument
An archaeological site and human bones on the island of Gran Canaria
Underground Lava Tube Cave in the Desert
Truchas, NM: Roadside Welcome to Truchas sign. Truchas is about 37 miles north of Santa Fe on the high road to Taos.
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