An industrial waste tourist attraction.

In this cemetery stands the country's first public crematorium.

This labyrinthine resting place of Black American leaders has been reclaimed by nature.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

This banal Parisian entranceway is not what it seems.

No one knows who painted this mysterious mural in a Penn State basement.

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

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

The oldest stone house in Paris was built by its most famous alchemist.

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

The historic Masonic Lodge in which the first-ever female Mason was initiated.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

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

Notorious artist squat renovated into legal studios.

Abandoned railway line circling the city of Paris.

The curious underground history of keeping Paris clean.