The park adjoins the Elizabeth Hartwell Mason Neck National Wildlife Refuge and encompasses 1,814 acres (7.34 km2).

The Lexington site, indicating a plantation subdivided from nearby Gunston Hall (on the other side of the peninsula, since founding father George Mason owned virtually all the peninsula, as did his father of the same name and son who operated that plantation using enslaved labor, hence the colloquial name), was listed in 2013.

[1][2] In addition, it is on the Star Spangled Banner National Historic Trail based on a naval battery and fighting nearby during the War of 1812.

A plaque outside the visitor center acknowledges Elizabeth Hartwell, whose advocacy for eagle protection helped create the park.

She and several other people who advocated founding the park, including Virginia legislators William Durland and Clive L. DuVal II, are mentioned in a plaque by the flagpole in front of the visitor center.