This mysterious Sardinian festival sees a horde of blank-faced equestrians compete for tin stars.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

This 21st century cabinet of curiosities includes dinosaur bones, moon rocks, film memorabilia, and more.

This natural gas vent certainly earns its name as the smallest volcano in Italy.

Naturally preserved bodies are eerily staged throughout the crypt in varying poses.

A sulfuric hellscape in southern Italy.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

Crushed coral and crystals give the sand its signature coloration.

This large, circular tomb is the final resting place of the first emperor of Rome.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The middle finger of modernity.

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

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

A 16th-century horror show built in a lovely Italian garden.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Six beautiful wooden giants are hidden around Copenhagen.

This painted Lego bridge is the product of over a century of locomotive history.

Twisted trees shaped by coastal winds make this woodland look like something from a spooky story.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

This "floating railway" is one of the world's oldest monorail systems.