1. On June 29, 1900, the United States Secret Service established a training facility in the town of Beltsville, Maryland. The facility was used to train agents in protective services and counterfeiting investigations.

2. On June 29, 1942, the U.S. government took control of the Baltimore and Ohio Railroad, one of the oldest and largest railroads in the country. The move was intended to help support the war effort by ensuring the efficient transportation of troops and supplies.

3. On June 29, 1952, the Maryland State Police created a special unit known as the K-9 Unit, which was tasked with training and deploying police dogs to help with investigations and apprehensions.

4. On June 29, 1963, the Chesapeake Bay Bridge, which spans 4.3 miles across the Chesapeake Bay, was officially opened to traffic. The bridge is now one of the most iconic landmarks in Maryland and a major transportation artery for the region.

5. On June 29, 2015, Maryland became the first state in the country to ban the use of styrofoam containers for food and drink service. The move was aimed at reducing plastic waste and promoting more sustainable practices in the food service industry.