42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

Couple's personal collection of pinball machines turned public pinball museum.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The oldest operating pharmacy in the world features 800-year-old recipes.

The middle finger of modernity.

The largest and most famous wax anatomical collection anywhere in the world.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

Jesus' footprints and the first catacombs in the world.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

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."

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

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

A fairy tale castle in modern Rome.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Art historians have debated the identity of this medieval stone rider since the 19th century.