Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

A collection of objects supposedly singed by the hands of souls in purgatory.

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

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

A fairy tale castle in modern Rome.

Architectureal fantasy quarter of Rome.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

Where Venice's gondolas go for a tune-up.

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

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Museum devoted to the artificial language of Esperanto.

Handsomely crafted representations of our round planet.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The best bagels in Berlin are tucked away in an independent bookstore.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

The final resting place of many of Germany's most famous communists.