Wash in ton Dee.See.

(courtesy of destination 360)

Washington D.C. is often said to be very bland and plain, most people say that it is a city best kept to boring old bureaucrats. But the key to D.C.'s appeal is the National Mall, which contains an abundance of world-class museums that are friendly to any family's budget, this is because it's free. Other family-friendly tours are the Lincoln Memorial, war memorials (such as the Vietnam or World War II), the Capital Building, the White House, and many more provide excellent family attractions. Another interesting spot in Washington D.C. Is the fish market. It is just intriguing to go there and watch how everyone interacts with each other.

(courtesy of wikipedia)

Washington D.C. is not a vacation spot that you should spend a week there, it is more of a spot where you can spend three days there and check out all these places. It's nice to see all of them but it will bore the kids easily