An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

This magical-looking island is notorious for the misfortunes suffered by its owners.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Dedicated to the "father of modern education," this museum documents the history of education in Czechia.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Slum Settlement Filled With Mountains of Garbage.

A network of ancient Egyptian tombs built into the cliff face along the Nile.

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