The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

This 15-foot tall obelisk commemorating the Philadelphia-Baltimore railroad connection sat neglected for over a century.

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

A curious building honoring past and current members of a historic musical comedy troupe.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

Huge masonic hall in Philadelphia with lavishly themed rooms.

The United States Capitol's former columns still stand.

A private residence adorned with a gorgeous mural dedicated to the buzzing insect.

This spot memorializes one of the greatest plays in NFL history, unless you happen to be a Raiders fan.

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

The last street in Pittsburgh that's paved with wood.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.