We caught the boat at National Harbor, a trendy new development in Prince George's County, Maryland, on the Potomac River just east of the Woodrow Wilson Bridge. It was a HOT day, so Christie had to use her shawl at times to keep the sun off. All the sunscreen in the world wouldn't have been enough that day. The good news was that it wasn't crowded on a Tuesday, and we enjoyed to lack of lines and the full attention of the guides. Mount Vernon is another MUST for those of us interested in American History.