Nowadays, research is at your fingertips with the click of just a few buttons. You can learn about anything using your phone or laptop, and there are few barriers for the curious. Unless they’re trying to learn about what’s inside these top-secret locations, that is.
All of the sites on this list are heavily-restricted, which means they are off-limits to the public due to hazardous conditions, political issues, rumors of hauntings and aliens, and other reasons. All of these places impose heavy fines, if not jail time, for those foolish enough to try to sneak in to capture photos with their smartphones.