Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

This might just be the TARDIS of bookstores.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

Huge masonic hall in Philadelphia with lavishly themed rooms.

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

Mysterious rocks that ring musically when struck.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

A nondescript Seattle restaurant inherited a piece of European history.

The Cadillac Ranch for monster truck aficionados.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

In the parking lot of a fast food restaurant, a statue memorializing a prolific bull elephant.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

The only thing better than tubing down New Jersey's scenic Delaware River is doing so while eating a hot dog from a giant floating stand.

Once on display alongside a giant Gumby, it’s as tall as a nine-story building when fully extended.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

The home and studio of a visionary woodworker now stands as a museum and example of his artistic genius.

The antique hotel still has a jail in the basement, though the cockfighting ring is long gone.

This one-room cabin where the young colonel slept during the French and Indian War.

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

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