Oh did we ever love Liverpool! Our tour guide had a master's degree in the Beatles (you can get that at university in Liverpool) and we saw the outstanding Beatles Story, where we got to experience the old Cavern in all its dark and cramped glory.
On the way out Parker got to see the world's tackiest party barge (a sinking Titanic).
On the city tour we saw the downtown club scene (including the original and current site of the Cavern) and the locations of Penny Lane and Strawberry Fields. The song Penny Lane, interestingly, isn't named for the street, but for the bus stop on the street, which was where all the locations can still be seen.