The Museum of the Communist Party of China is a large official museum north of Beijing's Olympic Green, opened in 2021 for the party's centenary. It presents the Communist Party's history from its early revolutionary years through the founding of the People's Republic and into the present.
Expect a polished, state-framed version of history rather than a critical museum. For visitors interested in modern Chinese politics, propaganda, or official memory, that framing is part of the point.