Montgomery County does have some lovely historical sites. For a long time I had wanted to see the Clara Barton National Historic Site. My friend Rob wanted to go to Glen Echo Park and the C&O Canal Towpath near there. So this made for a nice little daytrip.
You can only see the inside of the house while on the NP Ranger-led tour. It was just us and a mother and daughter, so that was nice.
Barton lived in the house for the last 15 years of her life and it also served as the headquarters of the American Red Cross (she was its founder) at the time. The central hallway of the house was lined with closets filled with medical supplies ready to be sent to disaster areas/war zones.