The Washington Monument and the Jefferson Pier are near the center of the mall, south of the White House. Directly northwest of the Washington Monument is Constitution Gardens, which includes a garden, park, pond, and a memorial to the signers of the United States Declaration of Independence. Just north of Constitution Gardens is the Lockkeeper's House, which is the second-oldest building on the mall after the White House. The house is operated by the National Park Service (NPS) and is open to the public. Also on the mall is the National World War II Memorial at the east end of the Lincoln Memorial Reflecting Pool; the Korean War Veterans Memorial; and the Vietnam Veterans Memorial.