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

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

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

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

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

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

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

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

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

Huge masonic hall in Philadelphia with lavishly themed rooms.

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

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

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

A rare view of a preserved Victorian science museum.

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

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

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

This plaque marks a place where one of Hollywood’s most famous dancers got his start.

Once used to screen films for theater owners to rent, this historic building is now a start up hub.

This secluded walking trail is a hidden gem of a Pittsburgh park.