This giant disembodied horse head seems to balance impossibly on its nose.

The pop art icon's gravesite is broadcast 24 hours a day on his museum's website.

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

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

Pittsburgh's literal underground railroad.

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

Huge masonic hall in Philadelphia with lavishly themed rooms.