A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

Turnip-shaped island just off the Michigan shore in Lake Huron.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

An abandoned relic of the city's failed experiment with below ground transit.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

A hillbilly theme park that proved so unpopular the land wouldn't even sell on eBay after it closed.

A partial tunnel blasted into a steep ridge is all that remains of a failed railway across Arizona.