See the world's biggest spool of thread, along with the largest collection of sewing machines.

Outside the Missouri Quilt Museum, this large spool has more than one million yards of thread—and counting.

Rising 30 feet in the air atop Quarry Hill, the Old Powder House is the oldest stone building in the state of Massachusetts.

This once-forgotten African American cultural hub was an important stop on the Underground Railroad.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

This cemetery features modernist statues as strange as its name.

This bizarrely tree-like red skyscraper is one of the newer additions to Barcelona’s skyline.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

Balconies that have a most unusual accent.

This public amphitheater was once a key part of Monaco’s defense strategy.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

The mysterious “claw marks” said to be left by the Devil on Pisa’s famous cathedral.

A strange-looking 18th-century tower sits on a tiny islet just off Livorno.

The famous sculptor had a hand in this imposing fortress.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

In 1986, Keith Haring was arrested for painting this anti-drug mural on a Harlem handball court.

Harry Houdini plunged into the Charles River and performed one of his escape acts here in 1908.

The oldest continuously inhabited private home in the United States.

The oldest continuously-operated inn in the United States, once owned by Henry Ford.