The USS Shenandoah was the first all American built Airship. It was constructed in Philadelphia in 1923 and crashed In eastern Ohio September 3 of 1925 during a violent storm. There is a rest area off 70 east near SR 281 with a small museum, and a memorial about 7 miles down the road where there are small flags outlining where the wreckage fell killing 14 of 43 crewmembers. Pretty interesting stuff... If opportunity provides I recommend checking it out.