The Original London Sightseeing Tour: Hop-on Hop-off. See the best of London without the stress of rigid tour times and massive crowds on this hop-on hop-off bus tour. With your flexible, single-day pass, pick any date you’d like to hop aboard the double-decker, open-top bus for a comfortable sightseeing excursion. Great for kids and adults, your pass offers three route options with stops at main attractions like Big Ben, the Tower of London, Buckingham Palace and more. Bonus features include three city walking tours, a River Thames cruise and local discounts. Book this The Original London Sightseeing Tour: Hop-on Hop-off From $44.50 USD.