Two years ago, near the anniversary of 9/11, we had the opportunity to do some sightseeing around Johnstown and Shanksville while on a camping trip.  We checked out the Johnstown Flood Museum.  The video they showed was so impressive, we bought it to bring home and show our family.
We lucked out in that the weather was beautiful – upper 70s and sunny the whole time.  Perfect for walking around outside.
You can get a map from the Visitors Bureau in Johnstown that lists I think 15 historic covered bridges in the …