Phuwathid Summaviwat
Google
A small gallery featuring propaganda posters made during People's Republic era, many posters presents the point of view how the government would like to portrays the country, culture, and international relationships to their citizens back then.
If you're already in the area for Anfu Rd. or Jing'an Temple, a quick detour for this one is well worth it, and it's a must-see for Cold War history.
Search for the gallery in Amap or Baidu to find the correct address, then take the elevator to the 7th floor, where you will see a sign directing you to the gallery, the ticket is 25 CNY/person with no reservation required.
Walk-in is possible and not crowded, I spent about an hour there and there were no more than ten people at the same time. There is a gift shop inside that sells posters, books, and souvenirs, and you can also get a Little Red Book.