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

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

Millions of numbers carved in glass represent the tattoos forced upon victims.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Baroque celebration of the end of the Great Plague of Vienna.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Macabre astrological automaton clock dating to the late 1400s.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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

Cryptic messages embedded in the New York City sidewalk.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.

Nestled in the heart of Milan is a real wunderkammer of morbid curiosities.

The secret medieval communication system will whisk your words above the noise of the crowd.

The highest peak in the state of Vermont has some interesting features.

Stand at the center of this lakefront sundial, and you'll become part of the timepiece.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

This "thrice-cursed" island is allegedly home to Captain Kidd's lost treasure.