When we were in Washington a couple weeks ago, we made a quick trip into the United States Botanic Garden, which is literally in the shadow of the Capital Building. We were searching for places to get in from out of the rain. No better place to spend some time while waiting for the downpour to stop.
Outdoors was all a bloom. It rained all day. We did up the Native American Museum (wonderfully-designed museum with a native-foods cafeteria!), the Bureau of Printing and Engraving (saw dollars being printed!) and the National Archives (saw the Declaration of Independence, Constitution & Bill of Rights!). It never stopped raining that day. We were soaked.