A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

The remains of what was once the world's steepest passenger funicular.

The world's largest collection of materials relating to lesbian history is housed in a Brooklyn townhouse.

A toxic ghost town sitting atop a massive coal fire.

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

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

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

This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.

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.