Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

One man's lifelong obsession with death.

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

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

A curious building honoring past and current members of a historic musical comedy troupe.

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

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

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

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

Yo, Adrian!

The oldest surviving botanic garden in the United States.

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

Delicate Wurlitzers, creepy clowns, and The Noid all share space in this insane explosion of kitsch history.

A crumbling hospital from the 1850s on Roosevelt Island.

This backwater graveyard in the Hamptons became a trendy burial spot and posthumous status symbol for famous artists.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

The home, museum, and death site of Kodak's influential founder.

New York's oldest concrete structure is being preserved thanks to the gentrification of Whole Foods.

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

The factory for the popular Dumbo location, the Greenpoint shop is a quiet gem.

Opulent downtown movie theater now houses cars as an indoor parking garage.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.