1. Changing of the Guard in London, also known as the Changing of the Queen's Guard, is a ceremonial event that takes place outside Buckingham Palace and other royal residences. It is a tradition that dates back to the 17th century and is a popular tourist attraction in London.

During the ceremony, the Old Guard hands over responsibility for protecting the palace to the New Guard. The guards, who are dressed in iconic red tunics and bearskin hats, march to military music and perform intricate drill movements. The ceremony usually lasts about 45 minutes and takes place daily during the summer months, with a reduced schedule in the winter.

2. The Changing of the Guard takes place at Buckingham Palace, St. James's Palace, and the Tower of London. The ceremony at Buckingham Palace typically starts at 11:00 am, but it is recommended to arrive early to secure a good viewing spot. The event is free to attend and does not require a ticket.

3. To reach Buckingham Palace, you can take the London Underground to either Green Park, St. James's Park, or Victoria station. Alternatively, you can take a bus to the area. It is advisable to check the official website of the Royal Family or contact the visitor information line for the most up-to-date information on the Changing of the Guard schedule and any changes to the ceremony.