See londons highlights by retro double decker bus cruise boat and foot on this 55 hour tour take a seat on a vintage red routemaster bus and pass top london sights including trafalgar square big ben and the houses of parliament then soak in more london landmarks such as tower bridge and the tower of london on a thames river sightseeing cruise finally crown your tour with a visit to the stunning westminster abbey an unesco world heritage site and widely acknowledged as londons fines