The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Ride the subways of yesteryear.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

This massive boulder was hurled into a Zurich church when a gunpowder depot was struck by lightning in 1652.

This work of engineering is imbued with elegance and ingeniousness.

Watch cheese-flipping robots in action at this factory and museum.

The oldest church in Inverness witnessed the brutal executions of many Scottish soldiers.

This mountain trail inspired Nietzsche to complete his magnum opus.

Though it may look like a businessman's lost luggage, this case suspended under a highway bridge is actually a contemporary art installation.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

An opulent monument built for a duke who donated his entire fortune to the city of Geneva.

Visitors may notice something strange walking through this quaint German town.

This massive, 30-foot-tall statue of the famed Scottish knight overlooks a grassy knoll.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

If James Bond bungee-jumped off the side of a 720-foot dam, would you do it too?

The largest underground lake in Europe.

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

This tiny chapel withstood a massive mudslide and flash flood.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

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

This artistic fountain display pays homage to this area's theatrical history.

A unique bridge with an equally unique view.