A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

Five candy-colored villages on the Italian Riviera.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

A fantastic Christmas tradition where defecation meets the manger.

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

This massive blockhead sculpture hides an entire library.

This saucy statue once caused outrage among locals.

A contemporary art installation housed within a Gothic cathedral.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

An ancient necropolis of magnificent tombs.

Now a memorial to merchant sailors and Titanic victims, this medieval church was destroyed by bombing raids in 1940.

Discovered on a shipwreck after more than 400 years, this Renaissance ratter tells a very waggly tale.

Over a century old, this restored Victorian building is surrounded by a lush garden filled with rare palms.

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.

Known as the "Stairway to Heaven," this historic canal dates back to the 1700s.

A unique flight of canal locks that owe their form to 19th-century cost-saving measures.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Chelsea's soldiers were given strict orders when crossing this historic bridge.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.