This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Stockholm's deepest subway station is also a stunning ecological wonder.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

Sweden's "good old days" painstakingly re-created in a model village.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Stockholm's tiniest statue is of a small boy looking at the Moon.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

Several cannonballs of mysterious origins decorate two buildings in Stortoget's main square.

One of the world's first dedicated bank buildings in the world is now the oldest one.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

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

This fountain is dedicated to the workers who perished constructing the Fréjus Rail Tunnel.

The intricate geometry inside this Baroque-style dome was designed to create "terror of the human soul."

What once sat in the world’s spotlight is today a largely disused ghost complex.

After a catastrophic forest fire, a Greek artist transformed scorched tree trunks outside an old sanatorium into this haunting sculpture garden.

The abandoned summer estate of the former Greek Royal Family.

The hallucinogenic center of the ancient world.

This legendary city has been a tourist attraction for centuries.

Perched on a spindly rock spire in a Greek archipelago, this lighthouse would make a perfect wizard's tower.