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

Century-old shop, specializing in Occult products.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

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

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

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

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

What is the Thing?

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

Museum devoted to the artificial language of Esperanto.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

A church of bones, decorated with 40,000 human skeletons.