The Changing of the Guard happens in 3 locations in London:
Buckingham Palace
St. James’s Palace
Wellington Barracks
The ceremony starts at 11 a.m. every day except Sunday where it starts at 10 a.m. It lasts for 45 minutes and is free to view.
The ceremony can get incredibly busy during the summer months so arrive early to secure your spot. One of the best vantage points is the steps of the Victoria Memorial outside of Buckingham Palace.