There is so much to do in Washington D.C. that you could spend a month in the city and still not have seen the whole town. There are some forty museums, regular concerts, and performances (some of which are free). There are also many events every weekend, in addition to incredible restaurants offering high cuisine and one-of-a-kind dining experiences. But there are some D.C.-based attractions and events that define a trip to the nation's capital, and these should be on every first-time visitor's agenda.