A reasonably interesting, if quite small, museum on Yokohama History. There are lots of photos and some artifacts. Very limited labeling in English, as I recall. If you live here and are curious about how things looked in the area over time, including during and immediately after the war, there are worse ways you could spend an hour and 200 yen. Side note: It’s in a 1929 building that’s been reasonably well preserved, the same building as the Museum of EurAsian Cultures.