With this ticket you can enjoyunlimited travel on the operator s hop on hop off thames cruises forthree days embark and disembark from four piers along the thames enjoying as many cruisesas you wish encompassing londons best loved sights the cruises provide an insight into the many layers of history that have built up along the river the majestic houses of parliament the elegant dome of st pauls cathedral and perhaps londons most precious antique the tower of london are just a few