The remains of the roman Castle can be visited
Roman Castle Zwing

The Roman fortlet Zwing, also known as Kleinkastell Jägerwiese, was a Roman border outpost on the Odenwald line of the Neckar-Odenwald Limes. Situated on a mountain saddle near Hesseneck-Hesselbach in Baden-Württemberg, it served to monitor an important pass.
History+
The early history of the fortlet is marked by destruction. As early as the beginning of the 19th century, Count Franz I zu Erbach-Erbach had excavations carried out, which, combined with stone quarrying, destroyed much of its substance. When the Imperial Limes Commission, under Eduard Anthes, investigated the area in 1895, only a maximum 20 by 20 meter stone fortlet with rounded corners and a 75 cm thick wall could be identified. A single gate may have been located on the northeast side.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Datei:KK_Zwing.jpg
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: 49.5610, 9.1010