These curious caverns have been home to mushrooms, gangsters, and disco.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

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

Giant granite rocks standing end-to-end like a train of circus elephants.

Railroad came. People came. Railroad left. Town died.

Walk the whole Mississippi River!

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Granite outcropping that the state's tourism bureau doesn't promote because of its delicate ecosystem.