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Dasht-e Lut (Lut desert), rock formations called Kalut, World's hottest place, Kerman Province, Iran, Middle East

Stream flowing through the Dasht-e Lut (Lut Desert), World's hottest place, Kerman Province, Iran, Middle East

Sunburst and hiker in Windows Arches, Arches National Park, Utah, United States of America, North America

Sunrise eruption of Old Faithful geyser with stream, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sand dunes in the Ramlat Al Wahiba Desert, known locally as the Empty Quarter, Sultanate of Oman, Middle East

Hot Springs, Lower Geyser Basin, Yellowstone National Park, Wyoming, United States of America, North America

Tourists riding camels, Great Pyramids of Giza, UNESCO World Heritage Site, Giza, Egypt, North Africa, Africa

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Organ pipe cactus (Stenocereus thurberi), Organ Pipe Cactus National Monument, Sonoran Desert, Arizona, United States of America, North America

Teddy bear cholla (Cylindropuntia bigelovii), at sunrise in Joshua Tree National Park, Mojave Desert, California, United States of America, North America

Joshua tree (Yucca brevifolia), at night in Joshua Tree National Park, Mojave Desert, California, United States of America, North America

Panorama of Cathedral Rock covered in winter snow and ice, Sedona, Arizona, United States of America, North America

Petrified Wood in the First Forest of Petrified Forest National Park, Arizona, United States of America, North America

Panorama of a valley that is the Gateway to the Devil's Playground in Petrified Forest National Park, Arizona, United States of America, North America

People walking home across Nam Cuong sand dunes, Ninh Thuan, Vietnam, Indochina, Southeast Asia, Asia

Rock tomb, Madain Saleh (Hegra) (Al Hijr), UNESCO World Heritage Site, Al Ula, Kingdom of Saudi Arabia, Middle East

The Temple of Kom Ombo, constructed during the Ptolemaic dynasty, 180 BCE to 47 BCE, Kom Ombo, Egypt, North Africa, Africa

The Temple of the Winged Lions, Petra Archaeological Park, UNESCO World Heritage Site, one of the New SevenWonders of the World, Petra, Jordan, Middle East

The Luxor Temple at night, under a full moon, constructed approximately 1400 BCE, UNESCO World Heritage Site, Luxor, Thebes, Egypt, North Africa, Africa

The Roman mammisi, dating to the reigns of Trajan and Marcus Aurelius, Dendera Temple complex, Dendera, Egypt, North Africa, Africa

Steaming volcanic mud pools, Rincon de la Vieja National Park at foot of Rincon Volcano, Gaunacaste, Costa Rica

Eruption of Castle Geyser with rainbow in the spray, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sunrise eruption of Old Faithful geyser with stream, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Organ pipe cactus (Stenocereus thurberi) at night in Organ Pipe Cactus National Monument, Sonoran Desert, Arizona, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Mesquite flat sand dunes in Death Valley National Park, California, United States of America, North America

Joshua tree (Yucca brevifolia), in Joshua Tree National Park, Mojave Desert, California, United States of America, North America

Dusk over the majestic Tindaya mountain and village in the desert landscape, La Oliva, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Aerial view of sunrise over the dry desert land of Caldereta, Vallebron, La Oliva, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Geysers at Banos Termales in the Eduardo Avaroa Andean Fauna National Reserve, Potosi Department, Bolivia, South America

Aerial of the Madain Saleh (Hegra) (Al Hijr), UNESCO World Heritage Site, Al Ula, Kingdom of Saudi Arabia, Middle East

View from the Shrine to Hathor on the upper terrace of the mortuary temple of Hatshepsut in Deir al-Bahri, UNESCO World Heritage Site, Thebes, Egypt, North Africa, Africa

One of the few petrified trees almost intact, The Onyx Bridge in Petrified Forest National Park, Arizona, United States of America, North America

One of the few petrified trees almost intact, The Onyx Bridge in Petrified Forest National Park, Arizona, United States of America, North America

Delicate Arch at sunset with sunburst, Arches National Park, Utah, United States of America, North America

Tourists gather to watch Strokker geyser (geysir), an erupting spring at Haukadalur, Iceland, Polar Regions

Saguaro cactus (Carnegiea gigantea), photographed at sunrise in the Sweetwater Preserve, Tucson, Arizona, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America