Washington, D.C., drew almost 18 million visitors last year, so planning a trip can be a challenge. To make things easier, I recommend the services of American Excursionist, a company that works in conjunction with the Harper Travel Office. Not only can it tailor an itinerary to your specific needs, but it also offers many fascinating programs. These include curated tours of the Smithsonian, visits to the National Air and Space Museum with a former NASA astronaut, private tours of D.C. art galleries, and political briefings from influential lobbyists. You can even visit Woodrow Wilson’s private wine cellar, dating from the Prohibition!