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

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

A lover's walk between hilltop towns, decorated with graffiti love notes.

A suspended footbridge allows for traversing this gorge carved through the French Alps.

Walk through a restaurant's refrigerator door to reach this hidden bar.

Enormous, fluffy dogs frolic around this museum dedicated to a legendary Saint Bernard.

Medieval irrigation channels built into the sides of mountains provided Valais with water for hundreds of years.

The largest underground lake in Europe.

This Italian dam is covered in salt-hungry goats who manage to scale its almost vertical face.

This eclectic architectural gem played witness to Zurich’s colonial past.

Europe's largest dinosaur museum was founded by a passionate autodidact.

These spooky and unusual stone formations create an underworldly landscape.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

Caves famous for the dragon-slaying saint who lived there.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

A fortified palace in the shape of a ship on the Thiou river.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Breathtaking and huge 430 year old maps of Italy.

A hidden workshop for creating and restoring Papal mosaic masterpieces.

One of the most important yet well-hidden museums dedicated to the history of medicine.

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

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

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.