The fifth-longest natural arch in the world, and the longest outside China.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Try not to get slimed in Tribeca.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

The most loyal of little dogs, or a Victorian era publicity stunt?

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Decades before the scandal, this staircase on the river was a literal "water gate."

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The site of the climactic scene from the classic horror film is now a historic landmark.

An Irish Memorial commemorating those who perished due to potato blight.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Slyly buy a shake in the Parker Meridien lobby.

A bit of retro transportation flair preserved in the world's largest department store.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.