A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

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

The steepest classic funicular in the world glides along a dizzying incline.

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

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

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

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

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

An unassuming Swiss institution houses Europe's largest toy museum.

An interactive exhibition space dedicated to the kinetic sculptures of Swiss artist Jean Tinguely.

Extensive private collection of authentic Medieval devices used for human torture and execution.

Obscured within a ring of trees, this abandoned World War II relic hides on a German hillside.

Along the Rhine, about a mile from the historic Munster, learn the heartrending story of two lovers torn asunder, cast into unknown layers of time and space.

This cubist Vienna church building looks like some sort of alien stonehenge.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

An abandoned tower once used to study the cosmos hides within a thicket of greenery.