One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

An exotic wildlife habitat right off The Strip.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

A park full of outsider art, created by college students studying outsider art.

Mysterious rocks that ring musically when struck.

The world's largest public collection of PEZ memorabilia.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

A living antique aviation museum in the historic town of Red Hook, New York.

Located just behind a quiet residential neighborhood, this is ground zero for the Salem witchcraft hysteria of 1692.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

A giant Troll lurks under one of Seattle's oldest bridges.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

This ancient market is often referred to as the oldest shopping mall in the world.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

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

A forgotten "city of water" underneath the famous Trevi district.

Ancient ruins hidden underneath a modern luxury hotel.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.