A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

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

A rare view of a preserved Victorian science museum.

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

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

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

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.

An Irish Memorial commemorating those who perished due to potato blight.

Believed to be the birthplace of the United States Marine Corps.

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

Alexander Hamilton’s creation caused quite a bit of controversy.

The world’s first penitentiary, meant to be humane, drove men insane.

This sculpture of a fisherman spent six years at the bottom of the Schuylkill River.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

Yo, Adrian!

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

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.

A layered tribute to the work of mosaicist Isaiah Zagar.

America’s smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

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

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.