This is a list featuring the main cities of Belarus as well as cities of interest (such as the castle places). I may have forgotten to list few of them. How many have you already visited ?
Belarus ranks among the least visited countries in Europe, yet it offers beautiful landscapes with its mixed forests, 11000 lakes and several national parks featuring largest population of bison in Europe. The cities are also worth the visit, with well maintained buildings in centers, with colorful facades. The capital Minsk ranks as the third cleanest large city in the world.
Personally, I have visited Minsk, Mogilev, Grodno and Brest (and its fortress).