This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

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

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

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

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

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 first American department store, and home to the largest operating musical instrument in the world.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.