A 125-meter long "tribute to the Brazilian people."

Eduardo Kobra’s breathtaking 32,300-square-foot graffiti wall took over Rio’s Olympic Boulevard.

Crumbling remnant of Rio's colonial past tucked behind Corcovado mountain in the neighborhood of Cosme Velho.

Menacing or in memoriam, the Silent People and their meaning are left to interpretation.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

France's national museum of scientific and industrial instruments.

A museum of magic with a Sadist past.

A museum of carnival attractions where you are invited to ride the rides.

France's most famous cemetery, with some of its most curious tombs.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

This German museum is devoted to all aspects of grave culture from headstones to coffins.

This German bone house contains the remains of some 20,000 souls.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The fairy tale castle of the "fairy-tale king."