London and the United Kingdom have an overwhelming amount of sightseeing options and interesting historical places to see. Gray Line London tours offer a variety of guided tours to famous points of interest in London and around the city, including Big Ben, the Tower of London, and Windsor Castle. Find information and buy tickets for tours here: http://www.vacationsmadeeasy.com/LondonEN/activity/LondonSightseeingTours.cfm