This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

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

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Catacombs turned marketplace.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

The most confusing clock in New York.

The only subway station in the city that still makes use of gap fillers.

On the Hudson resides one of the largest clocks in the world.

The best way to get a sneak peek at the movies.

The television series' iconic giant foot was borrowed from this classical painting.

This enigmatic Iberian sculpture of uncertain origin may have once guarded a burial site.

The Museum of the Forum of Caesar Augusta showcases the city's ancient Roman sewage system.

At the center of London’s oldest roundabout stands an obelisk that was erected in 1771, but spent several decades elsewhere.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

The site of the climactic scene from the classic horror film is now a historic landmark.

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

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

This historic national park is covered in the stunning ruins of red rock pueblos.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The skyline of Montreal includes the silhouette of an unexpected fruit-shaped Canadian staple.

This bridge was constructed from the rubble of the infamous Bastille.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The unexpectedly beloved remnants of a controversial thermal power plant.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.