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

Current docking place of the SS United States, the fastest transatlantic ocean liner.

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

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

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

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

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

Yo, Adrian!

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

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

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

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

The oldest surviving botanic garden in the United States.

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.

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

A rare view of a preserved Victorian science museum.

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

The final resting place of some of Staten Island's earliest settlers and their descendants.

Staten Island's original central park is the former home of the city water supply as well as thousands of immigrant graves.

This abandoned artificial island off the coast of New York City is now home to dozens of harbor seals.

The pioneering photographer's prints are immortalized inside her childhood home.

During the American Revolution, this mansion hosted failed peace talks between the British and Americans.