This aluminum “stairway to heaven” has impaled at least a couple of birds.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

The only museum with its curator—and her pets—buried inside.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

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

A monument to a working class martyr.

A little sculpture with a large wardrobe.

Climb inside an iron crystal magnified 165 billion times its normal size.

An imposing statue of the first prime minister of Antigua and Barbuda stands in the middle of a traffic intersection.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

An art museum with an eclectic design and a scandalous past.

It houses the remains of a 17th-century version of the Titanic.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This church also serves as a lighthouse complete with a beacon.

The Habsburgs' royal collections of art and wonders.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

This fort dates back to 1588 and was colonized by the Portuguese, Dutch, and English and sits prominently on the Indian Ocean where azure water lap the coast.