Several years ago, I visit Washington D.C. with my children. I recently happened upon this picture from that trip, which I took inside the U.S. Botanic Garden. I was so impressed with this indoor garden. It was filled with such a variety of plants I didn't know where to look first. I can't wait until I have a chance to return.
If you ever get the chance to visit D.C., I do recommend a stop at this wonderful place.