This great value ticket entitles you to unlimited travel on the operator s hop on hop off thames cruises you may embark and disembark from the piers outlined below cruising between them as many times as you wish during one day 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