Johnstown Flood National Memorial (U.S. National Park Service)
https://www.nps.gov/jofl/index.htm
The South Fork Dam failed on Friday, May 31, 1889, and unleashed 20,000,000 tons of water that devastated Johnstown, PA. The flood killed 2,209 people but it brought the nation and the world together to aid the "Johnstown sufferers."
DA: 16 PA: 6 MOZ Rank: 18