Optical Telegraph Station No. 8 Mühlenberg (Kirchmöser)

The Prussian optical telegraph was a telegraphic communication system between Berlin and the Rhine Province that existed between 1832 and 1849, which could transmit official and military messages by means of optical signals over a distance of 588 kilometers. The telegraph line consisted of up to 62 telegraph stations, which were equipped with signal masts, each of which had six telegraph arms that could be operated with cables. The stations were equipped with telescopes with which telegraph operators read specially coded information from a signaling station and passed it on immediately to the next one.
Wikipedia

The Prussian optical telegraph was the longest telegraph line in Europe. The facility is known as the beginning of telecommunications in Germany. The stations were on average about 9.6 km apart, with the maximum distance being 16.0 km and the minimum being 2.1 km.