Behold the rickety wooden glory of the world's oldest operating roller coaster.

This icon of the Atomic Age now lays dormant.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

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

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

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

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

There aren't too many operational funiculars around, but Pittsburgh has two!

A failed piece of Orientalism has become the proud symbol of a community.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

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

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

This might just be the TARDIS of bookstores.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

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.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

The oldest surviving botanic garden in the United States.

A park full of outsider art, created by college students studying outsider art.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

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

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

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