The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

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

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

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

Steepest flood safety railway in the entire world.

Memorializing an American tragedy of massive proportions.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.

The first American department store, and home to the largest operating musical instrument in the world.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

Century-old shop, specializing in Occult products.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

An Irish Memorial commemorating those who perished due to potato blight.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

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

The world’s first penitentiary, meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The site of William McKinley's tragic assassination is only marked by an underwhelming boulder.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

Ruins of a once-prized railroad station in New York.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."