A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

An alchemist's "magic door" stands in the middle of a Roman park.

This enormous sinkhole hides a secret world created from divine wrath.

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

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

Pompeii's less famous neighbor is still revealing her secrets.

From Vikings to nationwide rebellions, this castle has seen its fair share of warfare.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

This western-themed amusement park is host to a large number of decaying animatronic cowboys.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

An abandoned castle owned and ignored by Masons carries a cursed history.

Built to transport German U-boats through the never-completed Masurian Canal, the locks near this Polish village are now home to a rope course.

This Native American settlement dates back to the Pueblo II period.

This gravestone and its inscription inspired a movement that has spanned generations and saved countless lives.

A once extravagant mansion, now reduced to ruin.

One of the oldest seagoing boats in the world can be found at the Dover Museum.

A neighborhood park in the city of Cáceres hides what some believe are revolutionary examples of Neanderthal cave art.

Parts of this former military training ground may have inspired parts of J.R.R. Tolkien's famous fantasy series.

In a largely deserted ghost town, a little brick building recalls its history as a gold rush hub and haven for outlaws.

Baked in 1898 and still almost flawless, this floral masterpiece is considered the world's oldest complete wedding cake.

These ancient rock graves were featured on the cover of a Black Sabbath compilation album.