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

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

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

This strange, big-tailed beast became a Pennsylvania town's unofficial mascot.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Designed by Horace Trumbauer in 1893, this Gothic-style castle is now a home for academics.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.