 In 1659, a clocktower was built on the east bastion; its pointed roof was replaced in 1760 with an onion dome.In 1893–94, the exterior wall was lowered by 6.5 m, making it possible to free the walled-up windows on the south side of the Landvogt's residence, and to dry out the walls.A rose garden was laid out on top of the now lower embankment.