LONDON, ENGLAND - NOVEMBER 10:  Photographers get a unique view of the River Thames from Tower Bridge's new glass walkway on November 10, 2014 in London, England. Unveiled today the glass floor panels along the bridge's high-level walkways weigh 300 kgs each, cost £1m and will give visitors a new view over the historic bridge crossing The River Thames.  (Photo by Peter Macdiarmid/Getty Images)