This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

Abbey built on the ruins of Roman catacombs.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

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

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

A curious cave church carved into the face of a cliff.

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

Wax models of disease and deformity are on display at this German medical museum.

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

After years of being casually peed on by humans, this tree is peeing back.

Stockholm's deepest subway station is also a stunning ecological wonder.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

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

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

This simple apartment may have inspired some of the most important theories in the history of science.

An architectural oddity of six stories, accessed by graceful ramps.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Paris' linguistic guide to the international language of, yes, love.

The first green space constructed on an elevated viaduct.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

Peeing dogs guard the Roman hunting goddess atop a fountain at France’s Château de Fontainebleau.

Monsters and miniatures are held in equal esteem at this wondrous museum.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.