London in One Day Sightseeing Tour including Tower of London Entrance and Changing of the Guard. Get to know London in one day on this sight-packed, full-day tour with an expert guide. Traveling by air-conditioned coach, see top London attractions such as St Paul’s Cathedral, Big Ben and Westminster Abbey. Watch the Changing of the Guard at Buckingham Palace, and then visit the Tower of London, the medieval palace-fortress where many English royals met a bloody end. Break for a pub lunch during your guided tour of London, and receive a ticket for a Thames River sightseeing cruise to use after your tour or another day. Book with us and Save 10%! London in One Day Sightseeing Tour including Tower of London Entrance and Changing of the Guard.