One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

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.

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

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

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

It would take 35 firetrucks to fill this enormous glacial pothole.

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

These disused steel furnaces are now haunting ruins that may one day be a national park.

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.

One man's real life disfigurement inspired a lasting local legend surrounding an eerie tunnel.

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

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

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

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

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

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

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

This park contains a number of standing stones meant to heal and inspire.

Pennsylvanian mass grave and possibly mass murder.

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

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

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