Hundreds of skulls and bones at the largest skeleton museum in the country.

A swamp that was the site of prehistoric water burials also managed to preserve its corpses for millennia.

A building so large that it has its own weather.

The humble home where the famous beat author lived briefly and wrote one of his most famous works.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

A rare view of a preserved Victorian science museum.

This abandoned ironworks was once the most important military supplier in America.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

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

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.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

America's first serial killer rests in anonymity.

The oldest continuously inhabited street in America.

"A hideous albatross in the Hudson River Valley."

Contrary to popular belief, this secluded statue doesn't represent Pennsylvania's founder.

Huge masonic hall in Philadelphia with lavishly themed rooms.

A unusual sanctuary for abused and exotic animals in South Jersey.

How this Pine Barrens hill got its name is uncertain, but on a good day the view from the fire tower is crystal clear.

The oldest surviving botanic garden in the United States.

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

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

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

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