This unique rock formation has become a popular walking trail.

It took over 100 years to decode this enigmatic epitaph for two buried brides.

Now owned by the National Park Service, this location was once home to illegal boxing matches.

Located more than 600 feet beneath sea level, this tunnel boasts the world's first undersea roundabout.

A concrete mushroom that divided Stockholm residents for nearly a century.

More than a century old, this cast iron bridge on the Balmoral Estate leads to nowhere.

This 20-foot mountain is made up of some 15,000 mannequins—if you visit, you can even take a piece home with you.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

Opened in 1956, the first modern indoor shopping mall in the world was inspired by the shopping arcades found in European cities.

Somewhat controversial when first unveiled, this gathering of sea creatures has become a hidden gem.

Once the largest gravity dam in the world.

Solving a 60-year mystery finally gave a name to the young woman known only by the color of her clothes.

From a supper club to a gay bar to an HBO shooting location, this 125-year-old Victorian mansion has lived many lives.

If you forgot something to read during your trip to Tokyo, this hostel has you covered.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Single runway interrupted by a busy road that cuts across its middle.

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

This sculpture may be the only known depiction of a man who helped finance the American Revolution and inadvertently created the dollar sign.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

The world's largest underwater restaurant is submerged off the southern tip of Norway.

One of the only places where Earth’s mantle lies above water.

One of the oldest active carousels in the country—but it might be missed by all but the keenest-eyed boardwalk strollers.

For decades, a bottle factory dumped their waste into these waters—now it's considered the best sea glass beach in England.

A former Canadian Pacific Railway station turned liquor store, the first and only station in Canada visited by British royalty.