A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

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

Architectural monsters are devouring this palace's every door and window.

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

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

The giant scales in this museum can still tell if someone is one of the devil's brides just by weight.

One of the oldest masonic temples in the Netherlands, built in 1757.

Strange secondhand shop showcasing taxidermy and oddies

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

Peek through a transparent pyramid and drink in the mountain made of books.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Elegant marble and old vaults fill this historic Dutch bank turned office space.

This colorfully-painted tunnel links two distinct parts of a historic neighborhood.

Museum dedicated to the terror regimes of Hungary.