The remains of the Castle can be visited
Ehingerburg Castle (Ruin)

The Ehingerburg ruin is in Bad Niedernau, a district of Rottenburg am Neckar. Once the residence of the Imperial Barons of Ehingen, it offers an insight into regional history.
History+
The exact period of the Ehingerburg's construction and decline is not known. As a hilltop castle, it served the Imperial Barons of Ehingen, who took their name from Ehingen, a present-day district of Rottenburg am Neckar. The complex was situated on the so-called "Schlossfelsen" above the Katzenbach Valley. Its castle hill was relatively small, measuring approximately 5 to 7 meters in width and 12 meters in length.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Peter Kreuzmann / CC BY-SA 4.0 via Wikimedia Commons
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 48.4472, 8.9053