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

An eccentric home in Sicily turns heads on a regular basis.

Ernest Hemingway was the first to sign this colorful wall covered in thousands of celebrity signatures.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Does this strange mural depict witches battling beneath a penis tree?

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

A beautifully well-preserved ancient Roman villa.

The only museum with its curator—and her pets—buried inside.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

This imposing modern citadel started out as a home renovation project.

A Spanish artist builds his own castle.

An abandoned Indian-inspired mansion.

Now a pile of ruins and rubble, this was a lovely mountain town as recently as 1960.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

A huge cathedral single-handedly constructed by one eccentric monk.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

A Romanesque tower appears when water levels drop.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Of course Salvador Dalí lived in a castle...

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.