Windsor Castle is a historic castle located in Windsor, England. It is one of the official residences of the British monarch and is also the largest inhabited castle in the world. The castle was originally built in the 11th century and has undergone many renovations and additions over the centuries. It has served as a royal palace, fortress, and state prison, among other uses. Today, it is a popular tourist destination, attracting millions of visitors each year to see its stunning architecture, historical exhibits, and beautiful gardens.

The castle is made up of several buildings, including the Round Tower, the Upper Ward, the Lower Ward, St. George's Chapel, and the State Apartments. The State Apartments are particularly impressive, with rooms like the Grand Reception Room, the Crimson Drawing Room, and the Green Drawing Room, all of which are richly decorated with antique furniture, paintings, and tapestries.

In addition to its historical significance, Windsor Castle is also famous for its stunning grounds, which include the Long Walk, a 3 km-long avenue lined with trees, and the famous St. George's Chapel, a medieval church that is the final resting place of many notable figures from British history.