When the Austin Dam failed it destroyed much of Austin...and then it failed again.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

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

Less a museum than a bizarre fantasy world created by artists and engineers.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

Abandoned former poorhouse, bible college, and haunted house in an Ohio hamlet.

Landmark dedicated to the plight of the American Indian in the 21st century.

A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

A school teacher's massive and terrifying self-built castle.

Small, privately owned island divided between Michigan and Ohio with abandoned vacation homes and a derelict lighthouse.

Home with Gothic windows featured in a famous painting.