We spent the July 4th weekend in the Poconos and hiked several trails. This picture was taken at around mile marker 119 on the Delaware & Lehigh trail that runs along the Lehigh river. The trail was built over an old rail line so it’s an easy walk. Along the way, we came across a circular building that housed these windows. Must have had something to do with the railroad, but what that might have been is a mystery to me.