SHIELDED FROM PRYING EYES
Humans are a naturally curious lot, and nothing is more frustrating than stumbling across an intriguing spot that's off limits to all (or all but a select few). Far from your average tourist traps, these places may even be steeped in local lore, but they often bar tourists for safety, security, or environmental reasons. Intrigued? We thought so. Here are 20 spots you'll have to admire from afar — if you're even allowed that close.