I've explored an awful lot in my world, but I have to say that this particular place is one of the most interesting that I've found. I was looking for entrances to underground in the local area and stumbled across it completely on accident. Eventually, I'm going to figure out how to build a decent house here without wrecking how it looks.
I ended up making a Photo Album on Imgur for it, so here you go.
I suppose I should have taken even more pictures...
It is open in one area, yes, which is a cliff/overhang, but goes deeper inside. The roof is almost as high as the mountain top and burrows a little ways through the mountain chain beside it, creating a rather massive cavern inside with only a few blocks on each side.
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