The Boiling Rock
The Boiling Rock was inspired by the prison island of Alcatraz (see Art Book p. 157).
But what I find really cool is that there’s a real place in the Philippines, the Taal Volcano, which is a boiling lake in a caldera in a lake with an island inside it. Pretty
cool flaming, isn’t it :D
Image source: One, two, three
If you want to know more about that volcano go watch BBC’s Wonder of Life. I really enjoyed that series.