This half-finished "city of toys" was almost Italy's own Las Vegas.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

Pilgrimage site for star-crossed lovers.

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

Architectural monsters are devouring this palace's every door and window.

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.

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

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

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

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

Thousands of flamingos and other bird species flourish in these Camargue wetlands.

This ancient theater was once the home of fierce gladiatorial battles.

Napoleon's childhood home is now open for people to explore the beginnings of France's short general.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

This Corsican Neolithic site is full of pre-Roman megalithic structures that may or may not be penises.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

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.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.