Groningen has lots of (hidden) little courtyards you can visit. Once you're inside, it feels as if you stepped into a small village instead of a big city. You visit these little courtyards if you love beautiful old houses and great culture.
The Pepergasthuis was self-sufficient and had it's own brewery and bakery, among other things. Around the first square are the church, the diner and the guardians room. The second square is surrounded by the houses (originally for the poor).
Until 1702, it also had a 'madhouse', where the mentally ill were provided care. Each sunday, this became a 'madhouse fair' for the residents of Groningen, who could come and see 'the crazy people' for money. Nowadays it's a resident home for Groninger people, but a nice place to walk around in the courtyard.