Dornburg

Dornburg borders in the north and west on communities in the Westerwaldkreis in Rhineland-Palatinate, with the other neighbours all lying in Limburg-Weilburg. Among them is the town of Hadamar, historically the seat of a county.
The “Dornburg”, which gave the community its name after its forerunner communities were amalgamated in 1974, is a roughly 396-m-high elevation upon which are found the remains of a ringwall site from La Tène times . Within it lay a Celtic settlement rather like a town. On the Blasiusberg was a heathen worship place. The Christian chapel built there later served until 1734 as the parish church for eleven of the area’s villages.

Wikipedia