A museum of carnival attractions where you are invited to ride the rides.

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

The oldest and smallest cemetery in Paris is only open to the public twice a year.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The ruins of an abandoned cemetery are among the last remnants of the old village of La Boulaye before a wealthy landowner had it relocated.

One of the most powerful religious centers in the Middle Ages, dubbed the founder of Western monasticism.

The first Russian Orthodox church in the Catholic city of Rome in almost a thousand years.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Breathtaking and huge 430 year old maps of Italy.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

The yawning maw of this pagan visage is said to bite off the hands of liars.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

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

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A deep mark on the remains of a Roman temple, believed to be left by a legendary warrior.

Plaques on its facade commemorate the Tiber's most destructive deluges.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The Pope’s secret escape route.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Few of the many visitors to this resort town know of its hidden Maya ruins.