Benjamin Franklin statue at the Franklin Institute. (Photo by John Greim/LightRocket via Getty Images) PHILADELPHIA - Some of the Delaware Valley's favorite and finest museums announce their reopening days.After having to shutter their doors due to coronavirus, the museums Philadelphia proudly boasts will recommence public hours, stretching their reopening dates from July 8 through September 12 and beyond.Not all of the well-known institutions have opening dates, yet.