i love pictures like these. i zoomed in on the mountainside that's directly behind the complex and along the 2nd highest part of it (the long slightly-level spine) and there appears to be a few small caves. a couple may just be gaps in foliage or large rocks with shadowy overhangs, but atleast 2 of them look like caves without a doubt. makes me wonder if they are really there, and if they have been explored yet. maybe thats how they got their sky views of the structures.