An eccentric playboy's astounding natural history collection.

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

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

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

Once America's longest-manned military fort, now an abandoned hulk.

9th century Abbasid mosque, damaged in modern warfare.

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.

A formerly abandoned mental institute, now back in business.

The site of a tragic massacre that spawned a multimedia franchise.