A museum of carnival attractions where you are invited to ride the rides.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

Elevated freight railway turned wildly successful urban park.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

This Parisian café sticks almost exclusively to an ethos of reuse.

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

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Explore nearly 400 years of English middle-class home life.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A portrait of the Charter Oak hangs in a frame made from the Charter Oak.

The world's largest public collection of PEZ memorabilia.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

This forgotten beach house built to look like a Frank Lloyd Wright masterpiece overlooks a hidden beach.

A hidden three-foot-wide house separates these two regal churches.

Large miniature theme park with 100-plus models.

Medicinal spa created with the discharge from a geothermal energy plant.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.