1. On August 11, 1814, during the War of 1812, British troops invaded and burned down the city of Upper Marlboro in Maryland. The attack was part of the larger British strategy to capture key American cities and take control of the Chesapeake region.

2. Clara Barton, the founder of the American Red Cross, was born in Oxford, Massachusetts on August 11, 1821. Although she did not have a direct connection to Maryland, Barton played a crucial role in providing assistance to soldiers and civilians during the Civil War, which had a significant impact on the state.

3. August 11, 1934 marked the official opening of the Great Smoky Mountains National Park, which extends from Tennessee to North Carolina. The park is home to a wide variety of wildlife and natural features, including the highest peak east of the Mississippi River, Clingmans Dome.

4. Another significant event that took place on August 11 was the launch of the Hubble Space Telescope in 1990. The telescope, which is named after astronomer Edwin Hubble, was designed to provide unprecedented views of the universe, and has since made numerous groundbreaking discoveries.

5. August 11, 2006 saw the end of a major construction project in Maryland, with the opening of the Intercounty Connector (ICC), a 18.8-mile toll road that connects Montgomery and Prince George's counties. The road was designed to alleviate congestion on other major highways in the area, and has since helped to improve traffic flow and reduce travel times for commuters.