Abandoned railway line circling the city of Paris.

A crumbling hospital from the 1850s on Roosevelt Island.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The remains of the medieval wall that once surrounded Paris with ties to the construction of the Louvre.

This small, ingenious cannon once helped regulate Parisian life.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

This emotive sculpture was originally created for the 1878 World's Fair.

The final resting place of the "father of special effects."

Claude Monet was baptized in this lavishly ornate Paris church.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

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

A short distance from the Eiffel Tower is the final resting place of several of the city’s more well-known and interesting characters.

Former hunting lodge of a duke who was an avid collector of impressionist works.

This bridge was constructed from the rubble of the infamous Bastille.

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

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

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

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

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

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

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 ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.