The site of America's first commercial oil well essentially disappeared after the town went bust.

No one knows who painted this mysterious mural in a Penn State basement.

A pyramid commemorates the birthplace of James Buchanan, the 15th president of the United States

The legacy of baseball great Roberto Clemente is preserved in a retired Pittsburgh fire station.

One of the oldest of its kind.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

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

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

The first of Lancaster's "rural cemeteries."

The final resting place of the Hollywood star who came to a tragic end.

A small museum along the Susquehanna River is home to a rich collection of Native American artifacts.

A soon-to-be-forgotten roadside spectacle loaded with local lore.

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

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

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

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

The oldest farmer's market in America is so ancient it was approved by the King of England.

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

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

Mysterious rocks that ring musically when struck.

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

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