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I have no photo of it, but when I went on a small tour in Ha Long Bay they took us out to a lone karst tower sticking straight out of the ocean, with an old staircase running from the mouth of a cave down to the water. We pulled our boat up to the cave mouth, went up the stairs and through the cave and came out into a little valley completely surrounded by vertical walls of karst, with trees and a little lake. It was like a tiny ecosystem in a coffee mug. Perfect supervillain lair. We weren't allowed to go closer to it, which is good since we'd have only damaged it.
It's hardly a secret, tourists go there every day, but I remember thinking, "wow, places like this actually exist".
