1. In 1934, the Johnstown Flood Memorial was dedicated in memory of the more than 2,200 people who lost their lives in the devastating flood that occurred in 1889 in Johnstown, Pennsylvania.

2. On May 26, 1897, the Allegheny Observatory, located in Pittsburgh, Pennsylvania, took its first photograph of a star, marking a significant breakthrough in astronomical research.

3. In 1945, the first officer candidate school for the Women's Army Corps was established at Fort Lee, Virginia, with Pennsylvania native Virginia I. Haines among the first to be selected.

4. Pennsylvania's first state park, Valley Forge State Park, was dedicated on May 26, 1893. The park, located in Montgomery County, Pennsylvania, was established to commemorate the sacrifices of the Continental Army during the Revolutionary War.

5. On May 26, 1864, the Battle of Totopotomoy Creek was fought in Hanover County, Virginia. This was part of the Overland Campaign during the Civil War and involved Union General Ulysses S. Grant's attempt to take the Confederate capital of Richmond. Pennsylvania soldiers participated in the battle, but suffered heavy losses.