Yva Momatiuk & John Eastcott / Volcanic Ubehebe Crater, Death Valley National Park, California

Pete Oxford / Bartolome Island a landscape of lava and ash, Galapagos Islands, Ecuador

Anup Shah / Aerial view inside crater of Mt Longohot, Mount Longonot NP, Kenya

Tui De Roy / Galapagos Land Iguana (Conolophus subcristatus) female searching for descent route into 1, 000 meter active caldera to nest, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Hawk (Buteo galapagoensis) overlooking 1000 meter deep active caldera, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) large male on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Cerro Azul caldera with lake and tufa cone at 5,900 feet, Cerro Azul Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) group wallowing in seasonal pool on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) group wallowing in seasonal pond on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Morley Read / Aerial shot descending towards Wawa Sumaco crater lake, with Sumaco Volcano in background, rainbow and pristine cloudforest, Napo Province, Ecuador, 2018. (non-ex)

Morley Read / Rising aerial shot ascending out of the forest at dawn, revealing Sumaco Volcano and Laguna Wawa Sumaco crater lake, Napo Province, Ecuador, 2018. (non-ex)

Morley Read / Timelapse of Sumaco Volcano, with montane rainforest and Laguna Wawa Sumaco crater lake in foreground, Orellana Province, Ecuador, 2018. (non-ex)