The corporeal remains of Napoleon III's dentist rest under this 15-story obelisk.

This 15-foot tall obelisk commemorating the Philadelphia-Baltimore railroad connection sat neglected for over a century.

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.

A rare view of a preserved Victorian science museum.

The humble field where the first Major League Baseball game was played.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

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

A legendary boxing venue and ring featured in Rocky V.

The first American axe throwing club.

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

Century-old shop, specializing in Occult products.

A layered tribute to the work of mosaicist Isaiah Zagar.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

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

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

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

This beloved marketplace mascot poops money and grants good luck.

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

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

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