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This is postcard London at its best. Crammed with historic churches, grand state buildings, and some of the world’s best art collections, Royal London and Westminster unite politics and high culture. (Oh, and the Queen lives here, too.) The places you’ll want to explore are grouped into four distinct areas—Trafalgar Square, Whitehall, St. James's, and Buckingham Palace—each nudging a corner of triangular St. James's Park. There is as much history in these few acres as in many whole cities, so pace yourself—this is concentrated sightseeing.