St. James's Palace is one of the oldest royal palaces in London, located in the City of Westminster. The palace was built by Henry VIII in the early 16th century and was originally used as a residence for the monarch and his court. Over the years, it has served as a venue for important state events, including coronations and royal weddings.

Today, St. James's Palace is the official residence of the Sovereign's representative in London, the Royal Court of St. James's, and is used for official ceremonial occasions. It is also the headquarters of several important organizations, including the Royal Society, the British Academy, and the Royal College of Music.

The palace has a number of impressive features, including the Tudor gatehouse, the Chapel Royal, and the State Apartments. The Chapel Royal is one of the most important religious sites in the country and has been used for many royal weddings and christenings. The State Apartments are lavishly decorated and are used for receptions and other official events.

Although St. James's Palace is not open to the public, visitors can catch a glimpse of the Changing of the Guard ceremony, which takes place outside the palace gates. The ceremony is one of the most popular tourist attractions in London and is a must-see for anyone interested in British history and tradition.