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Lascaux Caves, France

Sorry, but that's just how it is - you're not going to be let into France's most prestigious cave system and UNESCO world heritage site. We know it sucks, and we hate to be the ones to bear the bad news, but there's just nothing you can do about it. The cave is home to some of the earliest human drawings ever recorded. Always under the threat of degradation, the French government and other relevant institutions have gone to great lengths to preserve this historical site.

Wikimedia Commons

And that means no people are allowed to visit this marvel. It's for the sake of preserving history, people.