May 31, 1889: Johnstown Flood Kills 2,200 People
The catastrophic flood that destroyed Johnstown, Pennsylvania in 1889 soon became a familiar subject for amusement park dioramas. Thousands of curious spectators thronged to this “spectacle” at Coney Island, which opened in 1902 after being moved from the Pan-American Exposition in Buffalo. What is interesting is that there are no surviving photographs of what the interior of the exhibit looked like. Until 9/11, the Johnstown Flood was one of the worst losses of life of any disaster in American history.
More details of the exhibits can be found here: https://www.heartofconeyisland.com/johnstown-flood-show.html
Wikipedia: https://en.wikipedia.org/wiki/Johnstown_Flood
NY Times Reports: http://www.johnstownpa.com/History/hist30.html