- ... that Pennsylvania's Kinzua Bridge (remnants pictured) was the world's longest and tallest railroad bridge when built in 1882, became a state park in 1970, and was knocked down by a tornado in 2003?
- ... that the Cogan House Covered Bridge in Lycoming County, Pennsylvania was built by a millwright who preassembled the frame in a field beside the sawmill to make sure it all fit?
- ... that the Joseph Priestley House in Northumberland, Pennsylvania was the site of the first and only laboratory Priestley designed, built and outfitted himself, as well as several American Chemical Society celebrations?
- ... that the new Carl E. Stotz Memorial Little League Bridge over the West Branch Susquehanna River between Williamsport and South Williamsport in Pennsylvania is the seventh on that site, and that three of the previous bridges were destroyed by floods?
- ... that Snyder Middleswarth Natural Area lost its status as a Pennsylvania state park in the 1990s despite being a National Natural Landmark and Snyder County's only state park?