Notorious artist squat renovated into legal studios.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

Indents in the pavement are all that remain from a grisly death machine in Paris.

The curious underground history of keeping Paris clean.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

This museum is rotten with a century of wax medical deformities.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Rome's ancient Etruscan rival, now a park full of ruins.

If you want to talk to the Pope you will have to stare down this surreal vision of Jesus rising from a nuclear hell.

This delightful little museum is dedicated to only one thing: pasta.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

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

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

One of seven Jewish catacombs in Rome and one of only two open to the public.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.