When it's raining, the tourism moves indoors. But for local history buffs, this museum is worth a visit any day.
It's a fun museum, and if I had had more time, I would have stayed and explored more. But I had more on my plate that day, as I wanted to get to Universal Studios Japan to ride the coasters!
Osaka Museum of History is a five minute walk from Tanimachi 4-chome Station, across from the southwest corner of Osaka Castle Park in a large building. Take exit 9 or exit 2, and walk toward Osaka Castle Park; the museum is in a large building with large brownish diagonal tiles. It's open 9:30-17:00, closed on Tuesdays, and admission is 600 yen.