1. On June 10, 1776, the Continental Congress met in Philadelphia and began debating the draft of the Declaration of Independence, which would be officially adopted on July 4.

2. June 10, 1943, marked the official beginning of the famous Battle of Normandy, also known as D-Day, as allied forces launched a massive invasion on the beaches of France.

3. In 1889, the Johnstown Flood devastated the town of Johnstown, Pennsylvania, killing over 2,000 people and causing widespread destruction. The flood was caused by a breach in a dam on the South Fork River, and remains one of the deadliest natural disasters in American history.

4. On June 10, 1962, the first flight of the Bell XV-15 tiltrotor aircraft took place. Developed by Bell Helicopters and NASA, the XV-15 was a precursor to modern tiltrotor aircraft like the V-22 Osprey.

5. June 10, 2017, marked the opening of the Point State Park Fountain in Pittsburgh, which had been closed for several years due to renovation and restoration work. The fountain, located at the confluence of the Allegheny, Monongahela, and Ohio Rivers, is a major landmark and tourist attraction in the city.