Combo: Royal Observatory Greenwich Tickets + Thames River Cruise

- Explore the best of London with this combo, combining a visit to the Royal Observatory Greenwich with a relaxing Thames sightseeing cruise. - See the historic Octagon Room, gaze through the Great Equatorial Telescope, and stand on the Prime Meridian Line. - Enjoy a Thames cruise with live or multilingual audio commentary, plus views of the Tower of London, Big Ben, and the Houses of Parliament. - Go beyond the Prime Meridian! Upgrade to the Royal Museums Greenwich Day Pass to include entry to the Cutty Sark, the Queen's House and the National Maritime Museum.