A water pumping station disguised as a residential home to assuage concerned neighbors now tricks most passersby.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

Enormous crabs, bioluminescent jellies, and other amazing creatures from the ocean’s depths—some of which are in an aquarium for the first time ever.

According to legend, this tomb holds the secrets to time travel.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

For millennia, explorers were obsessed with discovering the source of the Nile—is this small mountain stream really the answer?

A 17th-century bezoar, dirt from an infamous site, and other curios decorate this unusual bar.

This elaborate High Victorian Gothic structure is one of the world's few 16-sided buildings.

Large Hadron Collider and the Birthplace of World Wide Web.

It's believed Matilda Fitzwalter's life was the basis for the famed literary figure.

The second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

This hulking behemoth is actually five interconnected towers built in the 1960s.

Small caves once used as a hiding place for some of those accused during the Salem Witch Trials.

An Aztec snake god has taken the material form of an apartment complex.

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

A historic covered bridge is but one example of an oddly prevalent American urban legend.

The oldest candy store in the world has been selling traditional sweets since 1827.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

The first ever diner included on the National Register of Historic Places is famous for its custard French toast.

The Ranger’s House exhibits fine mementos collected by Sir Julius Werner during the course of his life, including this infamous pendant.

Turns out you can see the world without ever leaving Maine.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

A comprehensive collection of toy and model trains, largely from the mid-20th century.