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The Lascaux Cave Paintings

Archaeology enthusiasts all wish they could still visit this old wonder, but sadly, they cannot. The Lascaux Cave Paintings were discovered by local French teens in 1940, when their dog ran into a mysterious cavern. Inside, they discovered some 17,000-year-old caveman art. Tourists have come in waves to see them since, but there are problems with the site that just won't go away, no matter how much officials tried.

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First, they had to close it because of the breath of thousands of humans. The extra humidity was causing fungus to grow on the historical paintings. They reopened it, but soon found an infestation of black mold, so they were left with no other choice but to shut it down. Truly tragic!