No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

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

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

Italian cave with exceptional acoustics and an unsavory history.

The world's oldest surviving anatomical theater, where "the dead are pleased to help the living."

A collection of grotesques lines the walls of this Italian villa.

The world's most active stratovolcano is almost always erupting.

This landmark of the Chicago silent film industry may not be in the picture business anymore but it still stands proudly.

An enormous park-like oasis, full of famous Chicagoans' graves.

A strange and haunting monument of unknown origin in the historic Graceland Cemetery.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Thousands of well-dressed mummies below a monastery.