This tombstone marks the spot where the legendary British spy met his end.

The burial place of one the greatest Arthurian authors, with the sword in the (grave)stone.

Spend the night in this former asylum for the incurably insane, which claims to be one of the most haunted places in the United States.

Incredible miniature towns and buildings created and decorated with thousands of tiny rocks.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Remains of an abandoned coral city.

Rainbow-hued local gem in Venice.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Five painted skeletons are hiding behind a church in this tiny village in the Italian Alps.

Distressing images of the Last Judgement adorn the walls of this medieval sanctuary.

Unruly residents were housed in this one-person cell until the Black Maria arrived.

This museum dedicated to the history of the medical bone trade and human osteology.

Hundreds of fiberglass structures line the side of the road in the middle of nowhere.

An unusual slot canyon in the Aztec/Navajo Sandstone has a cross-section like an inverted old-fashioned keyhole.

This arcade is one of the last places to catch a public performance by the now-defunct ShowBiz Pizza's house band of animatronic animals.

This magical grotto is adorned with a complex pattern of native seashells, minerals, and fragments of colored glass.

Enjoy the waters of this half-moon-shaped natural pool surrounded by breathtaking scenery.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

According to a gruesome legend, an architect sacrificed his wife to build this spectacular, 16th-century cathedral.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This small, nautical gift shop is home to a 500-pound behemoth.

A museum celebrating rare American motorcycles where everything runs—and none of it quietly.