Historic sites 历史古迹Museums 博物馆
Tagged historic and museum because both are true: the site is the former unit, and the visit is an exhibition.
If this is not the day you have the stomach for, skip it. The cathedral will still be there. Do not wander in on the way to something cute.
Getting there
Southwest of the center, in Pingfang, a taxi or the metro toward that district and then a short ride. It is not a walk from Central Street. Give the driver the museum’s Chinese name.
Staying nearby
Sleep in the center. You will want an ordinary dinner afterward, not a themed hotel. There is no good reason to stay in Pingfang.