High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

The Lowcountry color with the power to stop evil from entering a home.

The museum chronicling a treasure hunter's dream, fulfilled.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

This ancient market is often referred to as the oldest shopping mall in the world.

This mountain trail inspired Nietzsche to complete his magnum opus.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

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

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

A typical "Old South" manor, once owned by author Anne Rice, served as the setting for several of her witchcraft sagas.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The world-record holder for the longest bridge stretching continuously over water.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

For over 100 years, this Indiana town has had a tree growing out the top of the local courthouse.

In an odd geographic anomaly this city borders two different states on opposite sides of town.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.