An interesting tour into DC key sites - Lincoln Memorial, White House, Arlington Cemetery, Veterans Memorials, etc. As it was my second trip, I was a bit disappointed on how briefly everything was covered (absolutely aware of time constraints!), I just felt other tour groups were getting more insights from their guides, I happened to listen to them a few times rather than to our guide who wasn't sharing as much.
Anyway, it was great to be DC, would always recommend to make it part of your stay in the US.