This downtown Dallas art installation is always on the lookout.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

The walls and streets of the ancient city are peppered with penises.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

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

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

Southern Italy's spinning top village.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A young Italian couple has been locked in an embrace for over 6,000 years.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

A fake medieval village in the middle of Turin.

A once-luxurious, now abandoned hotel in the Italian Alps.

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

This subterranean shrine beneath a bike rental store celebrates the iconic Italian scooter.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

This is the oldest Roman-made bridge in the city still existing in its original state.

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

Rome's ancient Etruscan rival, now a park full of ruins.

Ancient ruins hidden underneath a modern luxury hotel.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

A lover's walk between hilltop towns, decorated with graffiti love notes.