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

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

This railway-turned-greenway provides a pedestrian link in downtown Detroit and celebrates urban artwork.

Standing guard on top of an old, vacant ice cream shop.

Dilapidated Mayan-themed ballroom was one of Detroit's most popular venues through the 40s.

A crumbling mountain resort that looks like it was abandoned in an instant.

Concrete igloos standing across from what remains of the Michigan Central train depot.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

An ornate Detroit church, left empty and ravaged by time.

This empty Detroit high school was too expensive to maintain or destroy.

This feline raises a friendly paw at drivers barreling toward the freeway.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

An abandoned, rusty old relic of railroad history stands at attention over the Cuyahoga River.

This icon of the Atomic Age now lays dormant.

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

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

The abandoned coal loading dock is a canvas for unsanctioned art.

Pennsylvania's own Roswell-style UFO mystery.

These disused steel furnaces are now haunting ruins that may one day be a national park.

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

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.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

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