One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

The Decoy Capital of the World.

The land is home to swimming ponies and a legendary 18th-century treasure.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

The only free-standing, vertical sundial in the US was keeping standard time before it was even invented.

The world's largest collection of ticks.

The house that Southern rock built now stands as a monument to one of the genre's favorite families.

Beneath the surface, something slithers. And if you find it, prepare to be slimed and glowing.

The remnants of sheer survival in Dublin's monastery district.