Bertradaburg

Bertradaburg - Credit: Wikimedia Commons

The Bertradaburg is a ruined hill castle on a rock spur, , above the village of Mürlenbach in the county of Vulkaneifel in the German state of Rhineland-Palatinate. It thus stands in the geographical centre of Merovingian Francia. Read more on Wikipedia

type: military installation
date from: Early Middle Ages; first recorded in the 13th century

Source: en.wikipedia.org