Windsor Castle, Principal British royal residence, on the River Thames in Windsor, Berkshire, southern England. It comprises two quadrilateral building courts, or upper and lower wards, separated by the Round Tower (erected by Henry II), a massive structure built on a mound and visible for many miles. The present-day complex has been reworked repeatedly since William the Conqueror first constructed a stockade on the site. The lower ward includes the Albert Memorial Chapel and St. George’s Chapel, the burial place of 10 sovereigns. The upper ward, part of which was damaged by fire in 1992, includes the monarch’s private apartments, visitors’ apartments, and the royal library.
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