Baltic Sea watchtower, Kühlungsborn

The Baltic Sea watchtower (Ostsee-Grenzturm) in Kühlungsborn is an old East German border troops watchtower that was manned by the Coastal Brigade (Grenzbrigade Küste) or GBK. As a maritime observation town of type BT 11 it was one of a series of originally 27 towers of this type on the coast of East Germany, of which only two survive.

Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).