The USSR Museum is a small collection of Soviet-era everyday objects and visual culture. Exhibits include portraits of Soviet leaders, film-star photographs, cameras, radios, household appliances, postcards, medals, badges, and stamps.
It is a niche stop, but a useful one if you are interested in the domestic side of Soviet history rather than only monuments and public architecture. Pair it with Novosibirsk's art and history museums if you are building a museum day.