Salt pans and volcanoes in the background, near Yaiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Ancient cave dwellings in the tufa formations at Goreme Open Air Museum, Goreme, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Volcanic landscape with rocky terrain in the foreground and a clear blue sky over the ocean in the background in Tenerife, Canary Islands, Spain, Atlantic, Europe

Red sunrise on Mount Tongariro with volcanic plain in front, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Dry volcanic landscape on the summit plain on Tongariro Alpine Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Aerial view of people riding camels in volcanic desert, Parque Nacional de Timanfaya, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Montana Arena cone at sunset, one of a chain of volcanoes south of Corralejo, Villaverde, Fuerteventura, Canary Islands, Spain, Europe

Mount Bromo (venting steam far left) and Gunung Semeru (background) in Bromo Tengger Semeru National Park, Java, Indonesia.

Camp at Cerro Rojo, Salar de Surire, Reserva Nacional de las Vicunas, Lauca National Park, Chile

Railroad tracks across Salar de Chiguana, Bolivia

Railroad tracks across Salar de Chiguana, Bolivia

Grass plain with Iztaccihuatl volcano, Paso de Cortes, Popocatepetl-Iztaccihuatl National Park, Mexico, Central America

Clearing storm clouds over Shiprock in the high-desert plain of the Navajo Nation in New Mexico, USA, Shiprock, New Mexico, United States of America