Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

The astonishing collection of an infamous criminologist.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

The world's longest and deepest train tunnel.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Artworks by loners, prisoners and the criminally insane.

At 929 pounds and 26 feet tall, this stainless steel fork can only be used by the likes of King Kong.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

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

This ossuary is more than five centuries old and is heralded as one of the finest in Switzerland.

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

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

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

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

Natural history museum displaying a famous taxidermied St. Bernard.

The bears of Bern have been a city highlight for over 500 years.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The Swiss artist's bulbous and overgrown shape-shifting sculpture controversially graces the center of Bern.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.