Architectural monsters are devouring this palace's every door and window.

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

The former home of an Italian artist is now a shrine to his ambitious works.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

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

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

2300-year-old Roman road connecting the empire.

The underground sanctuary of a mysterious ancient cult.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

A museum honoring Germany’s cucumber mecca offers a great dill of gherkin history.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

This Parisian café sticks almost exclusively to an ethos of reuse.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

One of the greatest maze designer’s greatest mazes.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

The history of radiation is on safe display at the foot of a radiation science laboratory.

France's national museum of scientific and industrial instruments.

A haunting collection of the vanished and disappearing natural world.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

One of the oldest medical collections in Europe focusing on rare surgical instruments.