The Original London Sightseeing Tour: Hop-on Hop-off. See top London attractions at your own pace on a comprehensive hop-on hop-off sightseeing tour! With three family-friendly tour routes and three transport link services available, this hop-on hop-off bus in London offers a perfect day of sightseeing for all the family. From the comfort of a spacious open-top double-decker bus, see all the top sights like the London Eye, Big Ben, Westminster Abbey, Tower Bridge and more. Book now and Save 10%: The Original London Sightseeing Tour: Hop-on Hop-off.