Cheering crowds greet Harry on walkabout ahead of UK wedding extravaganza

Crowds of well-wishers cheered Britain's Prince Harry as he made an impromptu walkabout on Friday outside the ancient walls of Windsor Castle on the eve of his wedding to U.S. actress Meghan Markle.Queen Elizabeth's grandson was joined by Prince William, his elder brother and best man, as he mingled with excited fans waving red, white and blue Union flags less than 24 hours before Saturday's lavish ceremony.