In this Parisian garden's grotesque former life as a zoo it fed exotic animals to the bourgeois and put humans on exhibit.

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

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

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

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The history of radiation is on safe display at the foot of a radiation science laboratory.

Statue of death tucked in the University of Medicine courtyard.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

Indents in the pavement are all that remain from a grisly death machine in Paris.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A surrealist timepiece by the artist of melting clocks.

This beautiful architectural gem was the first waste treatment facility in Boston.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

This popular Boston haunt is reminiscent of a time gone by, when slow cafes and sweet-smelling smoke wafting from patios was the norm.

One woman’s obsession gave birth to this lovely oddity at the Boston Public Library.

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.