The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

A diverse collection of wax, bone, papier-maché and mummified relics.

Once known for its horse-powered knife sharpening, this 200-year-old shop offers an array of blades and hard-to-find culinary tools.

One of Jeff Koons’s largest sculptures and his first commemorative work.

Ordinary art transforms to extraordinary thanks to locals' quirky sense of humor.

In this Parisian garden's grotesque former life as a zoo it fed exotic animals to the bourgeois and put humans on exhibit.

The world's largest reflecting pool is just two centimeters deep.

A miniature train-ride through Slovenia's largest cave system.

This historic floating crane became an unlikely symbol of the port of Trieste.

The Adriatic's most famous wind can be reliably experienced in the city's Marina.

This Roman monument is surrounded by more recent construction, offering a stark contrast between ancient architecture and the modern urban landscape.

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

The only museum with its curator—and her pets—buried inside.

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

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

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

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

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

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

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

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

France's national museum of scientific and industrial instruments.

This massive library holds what was once the largest book collection in the world.

In this truly magical place, rent hasn't been raised since the year 1520.