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

An unrealized dream to wirelessly electrify the entire Earth.

This forgotten graveyard in rural New York State once served a pioneering hospital.

A mysterious air force base built to resemble a Long Island fishing village.

A historic lighthouse steeped in rumors of ghost and pirate stories.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

A formerly abandoned mental institute, now back in business.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.