Hünenkapelle Ruins on Tönsberg

The Hünenkapelle (also called Hünenkirche, Tönskapelle, or Antoniuskapelle) on the ridge of the Tönsberg in Oerlinghausen is the ruin of an early medieval hall church, of which only the surrounding walls remain today. It is surrounded by a circular rampart system known as the "Sachsenlager" (Saxon Camp).

The Hünen or Antonius chapel probably dates from the late Middle Ages, the ruins of which have been preserved to this day. It lies in the core of the abandoned fortifications and was dedicated to Saint Anthony, the patron saint of hermits. Chapels like these were built in places where religious hermits experienced visions. The chapel was still used as a pilgrimage chapel in the 16th century. The Paderborn annals of 1693 show that pilgrimages took place from Dortmund at least until 1548. After the Reformation in Lippe, it remained increasingly unused and lost more and more of its importance. Most of the masonry was removed as early as the 16th century and the stones were used to expand a farm. The original cross of the chapel has been stored in the crypt of Paderborn Cathedral since 1548. The chapel ruins that exist today are a romantic replica from the 19th century.
Source:
de.wikipedia.org/wiki/T%C3%B6nsberg

Hünenkapelle on the Tönsberg with ring wall system -> a magical place
see also link
de.wikipedia.org/wiki/H%C3%BCnenkapelle_(Oerlinghausen)