Mackinac Island, Michigan: Skull Cave

According to a tour guide, Skull Cave used to be a large place.The Natives on the island supposedly used it as a collection spot for the dead. Fur trader Alexander Henry spent a spooky night among the bones there in 1763.

The cave got blown up sometime ago when authorities needed to build a road in the state park. You couldn't hide from anyone now, as Henry did once upon a time. But it's still a state historic site.

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