An unusual assortment of steerable wooden sleds is on display in a library in New Jersey where they were first invented.

This tiny structure was built by the creator of the Brooklyn Bridge.

Pennsylvanian mass grave and possibly mass murder.

Delicate Wurlitzers, creepy clowns, and The Noid all share space in this insane explosion of kitsch history.

Destructive children, start your engines.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

Arlington Cemetery exhibit dedicated to death and grieving.

America's first serial killer rests in anonymity.

A glittering Thai Buddhist temple in suburban Pennsylvania.

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

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

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

Where America's first doomsday cult awaited the end of the world.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

Yo, Adrian!

World's first "penitentiary," meant to be humane, drove men insane.

Century-old shop, specializing in Occult products.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

A rare view of a preserved Victorian science museum.

This forgotten building was one of the few Philadelphia-area breweries to survive Prohibition.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

A layered tribute to the work of mosaicist Isaiah Zagar.