When we mapped out the to do things for Washington DC, we did not know this place existed. At this point, we were so worn out that we just wanted to go back to our hotel. After we passed by the White House, we noticed a dome like building and decided to checked it out since we were heading that way back to our parked car. We realize it was a conservatory and found it was the United State Botanic Garden. At this point, it was getting hot and it was later in the day, we only walk through the out door garden and did not go inside. By now, we have been out all day and were tired.