You’re probably saying: what? Why should I visit a hospital if I am not sick? Trust me though, St. Hedwig-Krankenhaus is not only one of the oldest hospitals in Berlin, but also one of the most beautiful I have ever seen. So, whether you are into architecture, or just want to take a little secret detour from the touristy Hackescher Markt, this is a place worth exploring.
St. Hedwig-Krankenhaus was built for the Catholic minority of Berlin in 1846. However, the front facade (through which you’ll enter) built a bit later (1881–1905). Upon entering, the first thing you’ll see is one of the Sisters of St. Borromeo, the Catholic congregation which once founded the hospital, working at the reception desk in their religious habit. Inside the building, you’ll find some nice pieces of art, for example in the left staircase. Cross the yard to access the older part of the hospital. Annexed to the right side of the old main building, you also find a chapel (Marienkapelle). You should definitely take a look at its beautiful mosaic floor.
Please be respectful when you visit, it’s a hospital after all. However, there is a lot of coming and going during the day, so it won’t feel weird for you to just walk around. There is also a cafeteria inside the Kesselhaus building which is open for the public. I haven’t tried it so far, but I heard the food is good and definitely cheaper than all the touristy options nearby.