I doubt this will be anywhere as popular as the thread that inspired it, currently at 131 replies. There's a reason I haven't posted in it (at least to my knowledge). I think the real world is amazing enough! I wonder why some real places haven't been used in mainstream fiction. One friend often asks if I've been to Skyrim for real (it's probably why I'm happy not to play Skyrim/Zelda-esque games these days - I used to a lot before I started travelling).
It's good for some places to remain relatively undiscovered, given how crowded places can get.
I'll start with a couple from Bulgaria.
Buzludzha Monument. Built by the Bulgarian communist regime in the 1970s, and opened in 1981. It looks incredible enough from the outside, a UFO landed on top of a mountain, with a 70m tower. Then you go inside! I haven't been in winter, but it looks even more incredible:
Sadly, many Bulgarian's (far from all) feelings about communism and a law banning public display of communist symbols has seen it rot.
Belogradchik Fortress. Originally built during the Roman Empire. What a great idea to use what nature provided as a fortress. There are massive vertical, natural drops from three sides.
I'm using Pinterest/Flickr embeds so I don't use anyone's bandwidth, but I'll click all links too.