The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

This tiny cottage surrounded by railroads is the oldest surviving structure in Fairmount Park.

The humble field where the first Major League Baseball game was played.

Where America's first doomsday cult awaited the end of the world.

The oldest surviving presidential residence in the United States.

In this cemetery stands the country's first public crematorium.

A small museum along the Susquehanna River is home to a rich collection of Native American artifacts.

The slate extracted from these Pennsylvania quarries was once hailed as the finest in the world.

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

A modern frieze of ancient Grecian mythological figures playing a national pastime.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

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

This historic old movie house was the scene of one of the Blob's most iconic attacks.

Where the famed frontiersman was born, raised, and survived Quaker intrigue

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

An outlandish shoe shaped house built by an eccentric millionaire.

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

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

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

The first of Lancaster's "rural cemeteries."

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.