The Vietnam Veterans Memorial is a 2-acre (8,000 m²) U.S. national memorial in Washington D.C. It honors service members of the U.S. armed forces who fought in the Vietnam War, service members who died in service in Vietnam/South East Asia, and those service members who were unaccounted for (missing in action, MIA) during the war. Its construction and related issues have been the source of controversies, some of which have resulted in additions to the memorial complex. The memorial currently consists of three separate parts: the Vietnam Veterans Memorial Wall, completed first and the best-known part of the memorial; The Three Soldiers, and the Vietnam Women's Memorial. The main part of the memorial, which was completed in 1982, is in Constitution Gardens adjacent to the National Mall, just northeast of the Lincoln Memorial. The memorial is maintained by the U.S. National Park Service, and receives around 3 million visitors each year. The Memorial Wall was designed by American architect Maya Lin. In 2007, it was ranked tenth on the "List of America's Favorite Architecture" by the American Institute of Architects. As a National Memorial, it is listed on the National Register of Historic Places.