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.

Descendants of this colonial Pennsylvania family still travel from far and wide to visit the 300-year-old home of their Quaker ancestors.

Each step is a mere four inches tall, said to be measured by the stride of a woman wearing a hobble skirt.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

It may appear to be a fancy junk yard, but each item has a story to tell and a lesson to impart.

Memorializing an American tragedy of massive proportions.

A preserved 18th century homestead in Western Pennsylvania marks the spot where the Whiskey Rebellion began.

This icon of the Atomic Age now lays dormant.

This Old Testament garden features 100 plants from biblical times.

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

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

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Pittsburgh's literal underground railroad.

A living maritime paradox still floats in the same lake where it was built and resurrected... or was it?

A giant ball made from pieces of an old Jeep.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

A unique workspace where offices reside on pirate ships and inside gingerbread houses.

For decades, it has disappeared and reappeared as water levels rise and fall.

This dramatic rail curve was once the target of a failed Nazi attack.

The Master of Magnetism dominates the walls of a scrap metal yard to keep graffiti artists at bay.