London Pass

http://www.excursionpass.com/tour/london-pass "See all of London with the London Sightseeing Pass. With a choice of one, two, three or six consecutive days, the London Pass offers great value and convenience with free entry to more than 50 top attractions, including royal-related sites like Windsor Castle, the Tower of London, Kensington Palace and Westminster Abbey, where Prince William married Kate Middleton. With the pass, you can also visit other London attractions like the London Zoo, th