From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

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

The Devil’s own choice when he needs a drink in Brussels.

Lavish royal estate punctuated with heated greenhouses.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

Museum dedicated to wax representations of disfiguring diseases.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

Go inside to really appreciate this 500-year-old technological masterpiece.

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

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

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

An enigmatic modern marker left next to a historic Roman site.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A Nesting Doll of Churches.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

Architectureal fantasy quarter of Rome.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

An alchemist's "magic door" stands in the middle of a Roman park.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Water and windows define this defensive Italian well.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.