The front door of Buckingham Palace is always trembling. Buckingham Palace's job change ceremony, known as the most famous one in the world, attracts thousands of tourists from all over the world every year. The tall horses of the Royal Cavalry Guard, the red gold helmet, and the black caps of the walking guards and bands are magnificent, solemn and powerful, which is also a continuation of tradition. Buckingham Palace holds a job change ceremony at 11:30 a.m. every day from April to July. Other months are held on alternate days (odd days in even months, even days in odd months). But its time is often adjusted. If you want to watch the ceremony and avoid emptying, you must check the official website http://www.royal.gov.uk/royaleve in advance and go ahead. The best place to watch the job change ceremony is under the Golden Queen Victoria Monument in front of Buckingham Palace, facing this area of Buckingham Palace. And at least one hour in advance to occupy the favorable terrain. The Queen usually travels between July and September (August and September), which is the only time of year when Buckingham Palace is open to the public. It is said that in order not to waste taxpayer's money, the Queen took out her residence to give people a visit to subsidize the Royal expenditure. Tickets need to be booked in advance, because the number of visitors can be received at each time period is limited, on-site ticket purchase is likely to queue up or even empty. And you have to be prepared to move slowly in a long line.