In 1594 Edward Fortunatus retreated to Castle Kastellaun after losing the Margravate of Baden, and it became a residence again.

The ruin on the west side of the inner bailey that can be seen from far away is what remains of the east end of the palas and the adjacent rectangular powder tower.

The former palas (residential building with the great hall) is used as an open-air stage for theatrical performances.

In addition, on Sundays in summer the municipality of Kastellaun offers a children's activity programme.

A reconstruction of the wagon burial discovered in Bell in 1938, remains of Celtic pottery, fibulæ and jewellery, and a model of a Roman legionary's helmet convey an impression of how our ancestors once lived.

The first floor depicts the life of the knights and nobility in castles in Hunsrück during the Middle Ages.

On the upper floor are models and information about the former Pydna missile base and the Hunsrück peace movement as well as the current usage as a federal defence installation and festival site (Nature One).