A church of bones, decorated with 40,000 human skeletons.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

An enormous, inside-out glass globe built in 1935.

To find the "unicorns of the deep" you've got to go downstairs.

A fiery crater has been burning in the Karakum Desert since 1971.

Race through the maze, get your name on the sign.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

A Hawaiian stairway to heaven—that you can't climb.

During the solar phenomenon "Lahaina Noon" this bendy, curvy sculpture forms a perfectly circular shadow on the ground.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

What remains of the summer palace of King Kamehameha III.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

Hidden in the hills is a mysterious stone structure, known only to a few.

A black cottonwood gets a second life as a home for books.

This greenhouse was once a hockey arena.

The third-largest island in Canada is one of the remotest places on Earth.

This Norwegian satellite station provides ground services to more satellites than any other facility in the world.

The remote graves mark the mysterious deaths of four 19th century explorers.

Stockholm's last remaining paternoster elevator.

A rare chance to ride one of the few continuous elevators still in operation.

One of the last doorless, continuously moving elevators still in use in the U.K.

This doorless 20th-century elevator doesn't stop or slow down.

This unusual elevator doesn’t stop or slow down.