There are three memorials in central Berlin devoted to three groups that were victims to the Nazi holocausts. Of these three, the Jewish memorial is by far the largest. It consists of a number of concrete blocks of seemingly the same height, but the area is deeper in the middle, why the blocks are higher there. At the bottom there is an entrance to a holocaust museum (free entrance), where you learn about the plights of the Jews in Europe during WWII, including how many that were exterminated where.