Explore some of London's most historic riverside attractions on this 4-hour tour. Visit the Tower of London, a royal palace, prison, and place of royal executions, where two of England's queens, Anne Boleyn and Catherine Howard, met their fate. See Traitors Gate, the Bloody Tower, the famous Ravens, the Beefeaters in their magnificent uniforms, and the priceless Crown Jewels worn at coronations and other events. Then cross the iconic Tower Bridge for views of London and London Bridge, and walk along the River Thames to historic Borough Market, one of the oldest food markets in London.