坐上地铁，到Hyde Park Corner (Marble Arch too far)下来，就是通往白金汉宫 (Buckingham Palace)的第一个门户Marble Arch。Buckingham Palace opens in summer when Queen is out to other places in UK. A typical visit lasts between 2 and 2½ hours. It’s wise to buy tickets beforehand. You may not get ticket or the time you want if you want to buy it at the door. See http://www.royalcollection.org.uk/visit/the-state-rooms-buckingham-palace/plan-your-visit for more info.