Christ's blood preserved in a Belgian town.

Theme park featuring miniature replicas of European monuments.

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

The final resting place for the remains of 143 Habsburg royalty.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

The amazing wonder cabinets of a very rich Austrian archbishop.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

A public urinal so pretty, it was declared a national monument.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This emotive sculpture was originally created for the 1878 World's Fair.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

This demon atop the Notre-Dame de Paris looks utterly bored.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The video game-themed street art first popped up in the French city.

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