Collmberg, Summit in Wermsdorf, Nordsachsen, Germany

Collmberg is a 312.8-metre summit in the Wermsdorf Forest, about 6 km west of Oschatz near the village of Collm. Its summit is enclosed by a medieval earthen rampart roughly 200 m long and 100 m wide, with three further walls on the western slope. The 18-metre Albertturm, a three-storey tower with 99 steps, stands on top.

A medieval hill fort was built between 900 and 930 on the summit, creating a fortified place at this strategically important height. This structure was part of early medieval power consolidation in the region.

The location was long connected with the hunting traditions of Saxon princes, and traces of this past remain visible in its landscape. The surrounding forests still carry the marks of this noble use today.

The Albert Tower, built in 1854, leads up 99 steps to an observation platform with views in several directions. The site is accessible via a light to moderate climb from the valley below.

The observatory's seismographs, running since 1932, were sensitive enough to help investigate claims of a German nuclear test on 2 October 1944. In 1936–37 Heinz Lettau built a mechanically coupled horizontal pendulum here to measure the inclination of the Earth's surface. The station registers earthquakes worldwide from magnitude 4.8.