As the mother river of Britain, both sides of the Thames River have beautiful scenery, and most of the historical attractions are along the coast, such as Westminster Abbey, Big Ben, London Eye, St. Paul's Church, Shakespeare Theatre, Tower of London, Greenwich and so on. Free cruise rides are available on London pass. The cruise ship is at the dock beside Westminster Abbey, stopping at the Tower of London in the middle, and at Greenwich at the other end. If you want to go to the Observatory, it is convenient to take a cruise ship. It's best to photograph the Tower of London from the boat. There will also be guides on board to explain the scenery across the Straits.