Unfortunately, as an AI language model, I cannot browse the internet, thus I cannot verify across multiple independent sources. However, I can tell you that there is no Montpelier Park in Maryland. There is, however, a Montpelier Mansion located in Laurel, Maryland which is a historic house museum that offers visitors a glimpse into colonial life in Maryland. Visitors can tour the mansion and its grounds, as well as participate in educational programs and events. The mansion features exhibits and artifacts from the 18th and 19th centuries and is open year-round. Additionally, the area surrounding the mansion offers opportunities for hiking and other outdoor activities, and there are several nearby restaurants and shops. The best time to visit Montpelier Mansion is during the spring or fall when the weather is mild and the grounds are at their most beautiful.