Vast network of air raid tunnels beneath Lombardy's capital.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

A line of abandoned, alien-like fortresses dot the mountains of North Italy.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

Banksy gives themself artistic license with this piece of London street art.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Giant, pink stuffed rabbit on an Italian mountain.

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

Bell tower juts out from a village buried under a lake.

A cherry tree growing atop a mulberry tree.

The mountaintop inspiration for Umberto Eco's "The Name of the Rose."

An enigmatic modern marker left next to a historic Roman site.

A hospital where antique dolls are given new life.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

The naturally mummified body of a peasant girl saint.

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.