17. Mezhgorye, Russia

Russia is the largest country in the world, so it is full of surprises. There are plenty of ghost towns, mysterious sites, and other special places you can visit; however, Mezhgorye is not one of them. The small town hidden in the Southern Ural Mountains, and it is closed to outsiders. 

Two battalions encircle the town, and it is said to be home to a nuclear missile site, but nothing is for sure. It would make sense considering the level of secrecy, but there is no way to know. The Kremlin claimed that it is used as a bunker for Russian leaders and a vault for the countries treasures.