On the Markenhof estate near Kirchzarten Alexander Moch from Schwanau-Nonnenweier operated a farm since 1919, which also served as a hachshara, i.e. preparation for immigration to Palestine. The Markenhof is considered the "first kibbutz of German Jews" (Ruben Frankenstein). The teaching estate was financed by the Jewish entrepreneur Konrad Goldmann. He also established with his funds a synagogue on the farm, whose windows were designed by Friedrich Adler from Laupheim.

The Jewish inhabitants of Singen initially belonged to the synagogue community of Constance. In the course of the 1920s, their number increased to such an extent that a congregation foundation and the construction of a synagogue were seriously considered. In order not to always have to travel the long distances to the synagogues in Gailingen and Constance, they first set up a prayer hall. Salo Schärf, owner of the furniture store "Roll and Co.", made the rooms above his store in the Poststraße 19 and 21 (today's Freiheitstrasse) available for this purpose.

6 tombstones, red sandstone, bordered by a hedge