A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

Arlington Cemetery exhibit dedicated to death and grieving.

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

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

A rare view of a preserved Victorian science museum.

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

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

A layered tribute to the work of mosaicist Isaiah Zagar.

In the early 1800s, surgery was also a show.

Century-old shop, specializing in Occult products.

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.

The first American department store, and home to the largest operating musical instrument in the world.

This elaborate towering structure was once famed for its revolutionary height.

Huge masonic hall in Philadelphia with lavishly themed rooms.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

This abandoned cemetery is crumbling into ruin, exposing the artifacts and bodies buried there.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

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