5. Kennedy Center: If you have an evening spare during the 96 hours that you are spending in Washington DC, then make sure you head to the Kennedy Center. There always seems to be some sort of show going on there, and they all tend to be pretty thrilling. If there is nothing going on, there is also a free guided tour held from time to time which will take you through the history of the building and allow you to see all of the artwork which has been stored here. It is actually pretty interesting, but only do it if you are not really pressed for time whilst in Washington DC.