Executions were once held near this beautiful 18th-century fountain.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

For more than a century, revolutionary graffiti has marked the wall of a Parisian church.

The narrowest street in Paris.

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

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This demon atop the Notre-Dame de Paris looks utterly bored.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

This massive library holds what was once the largest book collection in the world.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

Statue of death tucked in the University of Medicine courtyard.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This residence straddles a border between Belgium and the Netherlands.

What appears to be an act of fruit vandalism is actually a cultural statement.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

This eclectic homestead is home to a miniature windmill and Connecticut's last tollbooth.

A giant ant model welcomes visitors to an exhibit about symbiotic organisms that live with army ant colonies.

The gravestone of an eccentric Connecticut doctor features dinosaur tracks and a pair of fossil tree casts.

This roadside wonder is as mysterious as it is beloved.

Amazing views of Long Island Sound can be seen from this mountaintop tower.