The secret medieval communication system will whisk your words above the noise of the crowd.

Da Vinci's equestrian statue, 500 years in the making.

This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

The mark of the Devil's horns on a marble column in Milan.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

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

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

This 47-story "M" needed 20 years to be completed

Massive galleon from a box-office bomb docked in Genoa.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

This abandoned Croatian stronghold never saw a great deal of conflict but it is still a beloved relic nonetheless.

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

This bridge was constructed from the rubble of the infamous Bastille.

The celebrated eyesore created by starry-eyed sweethearts.

Fighting the British and making game shows for over 150 years.

Giant topiary dog once played a role in a terrorist bomb plot.

This abandoned naval battery stood at the ready as recently as the 1980s.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.