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

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

A historic covered bridge is but one example of an oddly prevalent American urban legend.

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

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

Pennsylvanian mass grave and possibly mass murder.

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

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

The Home and murder site of the witch of Rehmeyers Hollow.

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

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

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

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

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

Yo, Adrian!

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

In which a local geological marvel becomes a quaint roadside attraction.

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.

The oldest surviving botanic garden in the United States.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

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