Colorful curls of hand-blown glass form a captivating tower in San Antonio's Central Library.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

Amsterdam's former hotspot for public executions and dissections.

What looks like a normal building is really a hollow facade hiding a subway vent.

Outposts of this restaurant chain were shaped like jaunty chapeaus.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

The tomb of history's greatest potato promoter is surrounded by tubers.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

A memorial to the first person killed by a motor vehicle in the Western Hemisphere.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

This landmark building is now a vibrant performing arts space with musical acts from around the world.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

Built just after the American Revolution, the oldest row house in New York City still stands in Chinatown.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

Amazingly detailed marble cinerary urns that once held the cremains of Roman elite.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

A replica of a 7th-century church hides in plain sight in the middle of the concrete jungle.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

An unexpected Easter egg lurks in the background of a cherub wall relief at the Breakers mansion.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.