CONTEMPORARY STYLE IN THE HEART OF MAYFAIR   Once the site of a royal residence, InterContinental London Park Lane is now the epitome of modern elegance. Located between Mayfair and Knightsbridge in view of Buckingham Palace, the hotel is not far from the Tower of London, Big Ben and Trafalgar Square. Also worth seeing is the Victoria and Albert Museum, Madame Tussauds and The National Portrait Gallery.