Geyen Castle (also Geyener Junkerburg or Geyener Wasserburg) is a former moated castle in the Geyen district of Pulheim, which has existed since the 14th century. It is located on the northern outskirts of Geyen in the direction of Pulheim.
The Geyen moated castle is an almost square complex. The arrangement of the buildings reflects their old function as a customs yard on the border of the Electoral Cologne and Jülich territories. At the north and west corners of the courtyard are a round and a rectangular tower. The inner courtyard can only be reached via a stone bridge on the north side, as the castle used to be surrounded by moats on all four sides, fed by the Pulheimer Bach. The slits for the chains of an earlier drawbridge are also visible.
A manor has been known here since 1337 from a document. This estate is the forerunner of today's Junkerburg and functioned as a customs yard on the Juliet-Cologne border. When the old Tollhof or Canishof was sold by the owner Johann von Canis to the Cologne patrician von Judde family in 1443, they tore it down and built today's Junkerburg.
After a fire in 1664, the brick castle was rebuilt in the baroque style. This building has survived to this day.
After von Juddes, the lords von Frentz and von Grass (from Fliesteden) were the owners of the castle. From 1784, when the farm went back to a Lord von Frentz, it was managed by half. In 1855 the last noble owner sold the estate; today it is in bourgeois ownership.