Publicado por
Daily Mail
Country
Reino Unido
The Algar do Carvão is a volcanic cavern located on Terceira, one of the largest islands in the Azores
The top of the vent is surrounded by green vegetation and there is a manmade staircase inside for visitors
At the bottom of the cave is a rain-fed lake that can swell to a depth of 50ft when it's particularly wet