Wild Wonders of Europe / Relanzón / Common raven (Corvus corax) perched on rock, La Caldera de Taburiente National Park, La Palma, Canary Islands Spain, March 2009

Wild Wonders of Europe / Relanzón / Berjenado peak viewed from the Caldera, Caldera de Taburiente National Park, La Palma, Canary Islands, Spain, March 2009

Wild Wonders of Europe / Relanzón / Mountains with low clouds surrounding them, La Caldera de Taburiente National Park, La Palma, Canary Islands Spain, March 2009

Wild Wonders of Europe / Relanzón / Canary pine (Pinus canariensis) forest, Caldera de Taburiente National Park, La Palma, Canary Islands, Spain, March 2009

Juan Carlos Munoz / View from the caldera rim of the Chico Volcano, Sierra Negra, Isabela Island, Galapagos, January 2009

Juan Carlos Munoz / Close up of foot of a hiker on the caldera rim of Los Gemelos, Santa Cruz Island, Galapagos, January 2009. Model released.

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

Igor Shpilenok / A hot spring ringed by thermophilic bacteria in the vast caldera of the Uzon Volcano, Kronotsky Zapovednik, Kamchatka, Far East Russia .

Igor Shpilenok / Steaming fissures and geysers in the caldera of Uzon Volcano, Kronotsky Zapovednik, Kamchatka, Far East Russia

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

Igor Shpilenok / Dalney (Far) Lake covered with ice, Uzon Caldera, Kronotsky Zapovednik Reserve, Russia.

Igor Shpilenok / Spring in the caldera of the Uzon Volcano, Kronotsky Zapovednik Reserve, Russia.