The fairy tale castle of the "fairy-tale king."

Elevated freight railway turned wildly successful urban park.

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Go inside to really appreciate this 500-year-old technological masterpiece.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

Five candy-colored villages on the Italian Riviera.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

The longest and tallest aqueduct in Britain can actually be sailed across.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

Be on the lookout for the symbolic insect all over the city.

Scattered throughout London are ancient remnants of the city's former bounding wall.

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

One of the few surviving street funiculars in the world.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

These abandoned country fairgrounds are filled with replicas of Spanish monuments.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

The topiary maze at the Habsburg hunting lodge.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The first Russian Orthodox church in North America and an Alaskan landmark.