If you have never been to DC, the Lincoln Memorial offers the most photogenic views of DC.
The place where Alex and Karin said "I Love you" (and where Alex fell in love with Brazilian food).
Contact your local representative to book a private or group tour of the Capitol Building
Perfect for those who love all things air and space.
One could spend multiple days inside and always find something new or interesting!
The Spy Museum is an independent nonprofit museum, so they do charge a few-for-entry unlike the other museums on this list which are owned through the Smithsonian. The Spy Museum documents the tradecraft, history, and contemporary role of espionage. It holds the largest collection of international espionage artifacts on public display. There are a ton of interactive spy-themed challenges, and one could spend multiple days inside this museum. We highly recommend this one!