FDR's Art Deco hospital tower was hopelessly inefficient.

One of its engravings is believed to be among the first representations of medical and surgical instruments.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

Giant marble phalluses on the sacred island of antiquity.

Ancient serpentine sacrifice holder that has stood the test of time.

Ozymandias’ time-keeping temple.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

Venice's island of the dead.

The ancient tomb acts as a calendar that keeps perfect time.

Europe's largest prehistoric mound – burial site of a legendary king?

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Rebuilt remains of a temple to Roman god Mithras.

Colorful boxes placed over the dead are left to rot and crumble.

The house where John Wilkes Booth conspired with his co-conspirators.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

"There's nothing there," and other lies the KGB told us.

Home to items never before seen by the public.

This simple, broken column marks the final resting place of one of America's most famous explorers.

Protecting the dead from opportunistic body snatchers.

The final resting place of soldiers' loyal canine companions.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

Ancient pueblos built into the base of a natural canyon wall.