by a ring wall and protected by a neck moat on its southern side. Trier Castle The Trier part of the castle complex can be reached via a gate building, to which a wooden bridge spanning the neck moat leads. It is adjoined by a large inner courtyard, which was redesigned into a rock garden by Robert Allmers in the 20th century. From there, the 20-metre-high Trier Tower can be reached, which stands to the north of it on a raised plateau. With its walls three metres thick at the base, it now serves as a water reservoir and cannot be visited. On the west side of the courtyard, facing the Moselle, is the Herrenhaus, a residential building still in use today, rebuilt between 1960 and 1962 on old foundations, having been destroyed during the Second World War by American artillery fire and a subsequent fire. At the north-western corner of the building, a battlements on the Moselle side begins on the western circular wall, which continues into the Cologne part of the castle. A second, smaller gate leads from the inner courtyard into the cour d'honneur to the northwest, in which the only surviving of the castle's former three cisterns is located. Its shaft is about 20 metres deep. The cour d'honneur used to be enclosed on its north-western side by a thick wall, of which only a section of full height and thickness remains today. In the northern corner of the cour d'honneur is a three-storey building, the top floor of which was built in Fachwerkbaubau and today serves as a holiday home together with the first floor. On the ground floor is the castle chapel with old wall and ceiling frescoes, whose furnishings include a baroque altar from 1779 and a baptismal font from 1515. The building is adjoined to the north-east by the preserved ground floor of the Trier Palas. Cologne castle In former times, the Cologne half of the castle could only be reached via a narrow wooden bridge and the adjoining Palatine Gate at the north-western corner of the complex. Adjacent to the gate is an inner courtyard, at the south-eastern end of which are two round towers connected by a covered battlements between them. Inside the southern tower, murals have been preserved showing the coats of arms of all the owners and feudatories of the castle. Via the former boundary wall to the