Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.

An Irish Memorial commemorating those who perished due to potato blight.

This beloved marketplace mascot poops money and grants good luck.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

The abandoned coal loading dock is a canvas for unsanctioned art.

Dr Barnes' $25 billion private collection of art and arboretum.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A curious collection of locks and keys.

A charming flea market shop dedicated to retrofuturistic apparati.

An antique curios dealer and hybrid taxidermist.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

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

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

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

The Argonaute submarine was the French navy's pride and joy in the 1950's.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

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

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

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

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

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

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

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

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