It is a truss tower located in the summit of Poppenberg.

It is one of the oldest steel lattice towers in Germany and was built in the year 1897.

The tower was built by the Nordhausen branch of the Harz Club.

The tower was also named after Otto, Prince of Stolberg-Wernigerode.

[1] The Poppenberg Observation Tower is situated on the 601-metre-high (1,972 ft) mountain, Poppenberg, east of the village of Ilfeld, found in the free state of Thuringia.