Dedicated to the "father of modern education," this museum documents the history of education in Czechia.

One of the oldest, well-preserved water treatment facilities in all of Europe.

This Czech church doubles as something of a permanent fashion exhibition for a statue of the Infant Jesus.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

Where the high court feasted, frolicked, and high courtesans put their royal lovers' diamonds to the test.

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

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

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

The curious underground history of keeping Paris clean.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

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

Paris' fabled purveyor of exotic taxidermy and natural history curios.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

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.

Statue of death tucked in the University of Medicine courtyard.

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

A subterranean shelter remains intact under a busy Paris railway station.