This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

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

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

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

Pennsylvania's own Roswell-style UFO mystery.

An outlandish shoe shaped house built by an eccentric millionaire.

This elaborate towering structure was once famed for its revolutionary height.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

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

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

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

America's first serial killer rests in anonymity.

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.

Yo, Adrian!

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

In the early 1800s, surgery was also a show.

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

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

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

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

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

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