This technological marvel is one of the world's first 3D-printed bridges.

Nose around a unique collection of more than 300 natural aromas used to craft perfume fragrances.

The spectacular history of spectacles on display.

This basement museum explores the art and artistry of fascism.

Cat art as far as the eye can see.

A big museum full of little worlds.

The hallucinogenic center of the ancient world.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

While most books are made of wood, these wooden books are truly made of, and all about wood.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

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

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

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

Rome's semi-secret peephole vista is also a former Crusader stronghold.

Ruins of a 10th century church tucked away deep in a botanical garden.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Geothermal waterfalls in Tuscany.

The underground sanctuary of a mysterious ancient cult.

Abandoned medieval hill town.

The school tested mustard gas for the U.S. Army during World War I.

This 16th-century monastery has been turned into a surrealist architecture compound.

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

The glowing blue Nymphaeum of Emperor Tiberius.