Throngs of people are descending on the historic town as well-wishers try to catch a glimpse of the royal couple. Thousands of police officers are mounting one of the biggest security operations in recent years.
Crowds Gather for Royal Wedding
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Royal fans gather outside Windsor Castle ahead of wedding of Britain's Prince Harry to Meghan Markle in Windsor, Britain, May 19, 2018.
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Amal Clooney and George Clooney arrive at St George's Chapel at Windsor Castle for the wedding of Meghan Markle and Prince Harry, May 19, 2018.
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Sarah Ferguson arrives for the wedding ceremony of Prince Harry and Meghan Markle at St. George's Chapel in Windsor Castle in Windsor, near London, England, May 19, 2018.
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David and Victoria Beckham arrive to the wedding of Britain's Prince Harry to Meghan Markle in Windsor, Britain, May 19, 2018.