40 U.S.C. § 8901 — Purposes

to preserve the integrity of the comprehensive design of the L’Enfant and McMillan plans for the Nation’s Capital;

to ensure the continued public use and enjoyment of open space in the District of Columbia and its environs^*, and to encourage the location of commemorative works within the urban fabric of the District of Columbia;

to preserve, protect and maintain the limited amount of open space available to residents of, and visitors to, the Nation’s Capital; and

to ensure that future commemorative works in areas administered by the National Park Service and the Administrator of General Services in the District of Columbia and its environs—