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

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

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

This colonial mansion has been home to a staggering number of American historic figures.

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

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

A hidden piece of Altoona's railroad history in a long-forgotten abandoned town.

A museum dedicated to the history & joys of the trail & your best chance to see hikers throwing up ice cream.

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.

A glittering Thai Buddhist temple in suburban Pennsylvania.

This jail which was in service for over a century is now open for curious visitors.

The home and studio of a visionary woodworker now stands as a museum and example of his artistic genius.

An outlandish shoe shaped house built by an eccentric millionaire.

The graffitied ruins stand hidden within the Pennsylvania woods.

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

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

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

Dr Barnes' $25 billion private collection of art and arboretum.

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 house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.