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

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

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

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

One of the oldest of its kind.

Contrary to popular belief, this secluded statue doesn't represent Pennsylvania's founder.

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

The oldest surviving botanic garden in the United States.

America's first serial killer rests in anonymity.

Arlington Cemetery exhibit dedicated to death and grieving.

One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

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