This 1920s Dutch barge is now a floating bookstore.

This Neapolitan exhibition hall grants weird and wonderful insight into the intricacies of human biology.

A special area of the National Archaeological Museum of Naples is located inside a metro station.

A rococo room covered entirely in porcelain originally constructed for another royal residence.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

An alchemist's "magic door" stands in the middle of a Roman park.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.

A beautiful Victorian-era cemetery, complete with a miniature village.

This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.

This institution collects the history of burlesque dancing with a titillating collection of ephemera and pasties.

A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.

Radical Bookstore and Community Space.

The Boston square dedicated to the dark poet who was born nearby.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

A plaque memorializes the Boston location of one of the largest nightclub fires in history.

This parking garage was the site of what was - at the time - the largest cash robbery in history.

The oldest covered railroad bridge still standing in the United States.

This historic mini-suspension bridge was swept away once but is now here to stay.