Karlshagen is a Baltic Sea resort in Western Pomerania in the north of the island Usedom.

Karlshagen also was the location of the housing development for high-level personnel and scientists working in the nearby laboratory.

Although the buildings were largely destroyed in the air raids of 1943/44, some parts are preserved.

The 75-metre-high pylons of a three-phase 110 kV alternating current overhead line running between Peenemuende and Karlshagen are visible for a considerable distance.

This line was built in the early 1950s, in order to transport the electrical power generated on the island to the mainland, as it was no longer needed in Usedom after the laboratory was shut down.