In Bobrek, the district of Bytom bordering Zabrze, there is the largest city's historical workers’ housing estate - the so-called “Nowa Kolonia Robotnicza” (“New Workers’ Colony”), which was established in the early decades of the last century for the families workers of the iron factory "Julia" (later named "Zygmunt") and of the coal mine "Graefin Johanna "(later named Bobrek "). Most of the more than a hundred multifamily homes were built in the style of Historicism with some elements of Secession.