The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

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

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

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

The largest 19th century panorama in the world still in-situ.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Incredible labyrinth of man made caves.

This historical Netherlands fortress still bears the marks of its single siege.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

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

Remnants of cone-shaped fascist bomb shelters in Milan.

This museum was invented in a novel before being made real by the author.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

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

The attic of a four-century-old canal house hides a clandestine church.

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

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

The oldest botanical garden in the world that technically isn't the oldest.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

A former plague hospital turned medical museum.