Hülchrath Castle is a two-part complex consisting of a high castle and a bailey to the north-east. The high castle has the shape of a ring castle, because the 1.75 meter thick enclosing wall looks circular at first glance, but is in fact polygonal. Its shape reflects the floor plan of the high medieval predecessor complex, and the moth mound and the surrounding ditch can still be seen in the terrain today. The ring wall was raised with bricks in the Electoral period, so that these new parts differ greatly from the older substructure. The lowest part of this consisted of horizontally layered basalt and Liedberger sandstone with leveling layers of tuff. Masonry of tuff rose above it. In the enclosing wall to the west of the gate tower, the old, 0.7 meter high battlements of the low ring wall are still clearly visible. Its elevated successor had a cantilevered battlement as its upper end, which was supported by a pointed-arched sandstone console frieze. You can still see it from the outside today. The curtain wall was flanked by three semi-circular shell towers. The castle chapel appears to have been near the south-east of them. The north-eastern one is called the witches' tower and is reminiscent of a dark episode in the Hülchrather facility. This gained notoriety in the 17th through numerous witch trials in which the so-called water test was carried out in the castle moat. In 1629, 13 women were burned at the stake in Hülchrath as alleged witches. A proverb of the population from that time said: "Whoever goes over the bridge in Hülchrath rarely or never comes back". Another half-open tower stands in the north-east part of the circular wall. The so-called bastion tower was not built there until the 17th century.