Clara Barton's house is a national historic site at Glen Echo Park in Bethesda, Maryland. Barton lived in the house for a number of years, and the building served as one of the first headquarters of the American Red Cross. The park used to give tours of the site, but it's closed now; I don't know if there are plans to reopen it. It could use a bit of sprucing up, frankly.
Architecturally, the structure is unusual: it has a facade of stone towers with pink caps, giving it a palatial appearance, but behind this is an ordinary wood-frame house. It proved to be a challenge to paint, all the more so because of the intervening foliage. I'm not very happy with this first effort, but I'll give it a try again later.