A completely round house designed for the Atomic Age.

Designed by Horace Trumbauer in 1893, this Gothic-style castle is now a home for academics.

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

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

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .

This local gem houses the largest collection of pre-Raphaelite paintings outside of the U.K.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

This weeping, 10-foot-tall sculpture was a maquette for a 9/11 memorial.

This "thrice-cursed" island is allegedly home to Captain Kidd's lost treasure.

This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

A field of nothing but boulders which resembles a giant's gravel driveway.

Featuring the largest CinemaScope screen in Pennsylvania, this drive-in has entertained moviegoers for more than half a century.

The land is home to swimming ponies and a legendary 18th-century treasure.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

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

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

Iceland's tribute to its thankless civil servants.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

The first American axe throwing club.

This beloved marketplace mascot poops money and grants good luck.

A daily replay of the experiment that proved the rotation of the Earth.

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