This national landmark is also home to a massive treehouse.

An underground blaze turned this village into a ghost town.

Grand architectural relics gain a new life in this Pennsylvania warehouse.

A collection of bite-sized buildings creates a magical mini village in the Pennsylvania mountains.

A wonderous place devoted to art and metal.

Hidden in the hills of Western Pennsylvania lies one of the best-kept ghost towns in America that you can legally visit.

America's oldest drive-in movie theater has been in continuous operation since 1934.

These hooded graves are the only of their kind in the United States.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

A "house to which to flee" for settlers in colonial Pennsylvania.

Penn State's giant bug collection.

Built in the 1970s, this curious modular home found new life as a sundae-shaped ice cream stand.

Inside this 150-year-old barn turned antique shop is a vast array of items for curios hunters.

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

An ideal wedding spot that is almost too ideal.

An occult-y, historic hotel with the World's Largest Ouija board on the roof.

An extraordinary collection of vampire-themed antiques lurks on the second floor of a store.

A quirky collection of outsider art made from automobile parts.

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

Journey through a collection of over 35,000 Halloween items from all generations.

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

An outlandish shoe shaped house built by an eccentric millionaire.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

These disused steel furnaces are now haunting ruins that may one day be a national park.