Rosemary Hills Park is a charming green space located in the state of Maryland, near the border with the District of Columbia. While it is not located directly in the District of Columbia, it is still easily accessible to visitors from the capital city. Here is a summary of the park, based on information from multiple independent sources.

Reasons to Visit:
1. Tranquil Atmosphere: Rosemary Hills Park offers a serene and peaceful environment, perfect for those looking to escape the hustle and bustle of city life. Visitors can enjoy the tranquility while taking leisurely walks or having a picnic in the park.
2. Beautiful Nature: The park is adorned with stunning natural beauty, including lush greenery, tall trees, and vibrant flowers. It provides a great opportunity for nature lovers and photography enthusiasts to explore and capture the beauty of the surroundings.
3. Outdoor Activities: Rosemary Hills Park offers various recreational activities, such as playgrounds, sports fields, and tennis courts. Visitors can engage in activities like jogging, playing sports, or simply enjoying quality time with family and friends.

Points of Interest:
1. Picnic Areas: The park features several picnic areas with benches and tables, providing a wonderful spot for visitors to relax and enjoy a picnic surrounded by nature.
2. Playground: Rosemary Hills Park has a playground for children, equipped with slides, swings, and climbing structures, ensuring a fun-filled experience for young visitors.
3. Tennis and Basketball Courts: The park includes well-maintained tennis and basketball courts, perfect for sports enthusiasts looking to engage in friendly matches.

Interesting Facts:
1. History: Rosemary Hills Park has a rich history, with its initial development dating back to the 1950s. It has since been expanded and improved upon to provide a better recreational experience.
2. Community Involvement: The park is actively supported and maintained by the local community, which contributes to its cleanliness and upkeep.

Best Time to Visit:
The best time to visit Rosemary Hills Park is during the spring or fall season when the weather is mild and pleasant. The park is particularly beautiful in the spring when flowers are in bloom, adding vibrant colors to the surroundings. However, visitors can enjoy the park's offerings throughout the year, as it remains open during all seasons.

Please note that while efforts have been made to provide accurate information, it is always advisable to verify details and check for any updates or changes before planning a visit to Rosemary Hills Park.