The Gray Line Leeds Castle, Canterbury, White Cliffs of Dover, Greenwich & River Cruise offers a full day of sightseeing around England. Each historical attraction offers many opportunities for sightseeing and exploring the history of the United Kingdom, all with the convenience of a fully guided tour. Find tickets for this tour here: http://www.vacationsmadeeasy.com/LondonEN/activity/LeedsCastleCanterburyCathedralDoverGreenwichRiverCruise.cfm