AT A GLANCE
Why go?
MP3 Pleinmont is a remarkably preserved World War II German naval observation tower on the west coast of Guernsey, one of the Channel Islands. Built in 1942 with twelve-foot-thick reinforced concrete walls, this five-storey rangefinding tower was the linchpin of an ambitious but ultimately abandoned plan to create a network of six such structures around the island. Today it operates as a museum you can climb floor by floor, with original-style rangefinders reinstalled and an interpretation that explains just how this extraordinary piece of military engineering worked.↗↗
The site sits within the wider remains of Batterie Generaloberst Dollmann, once one of the most powerful coastal artillery positions in the Channel Islands, and a recommended circular walk connects the tower to gun emplacements, a radar station, a minefield marker, and the contrasting unrestored sibling tower MP4 just a kilometer away.↗↗
What Is MP3?
MP3 stands for Marine Peilstand und Meßstellung 3—a naval rangefinding tower. When the Wehrmacht occupied the Channel Islands in June 1940, the Germans initially regarded the existing fortifications as hopelessly outdated. By 1941, Hitler ordered Guernsey transformed into a fortress, and the Organisation Todt mobilized thousands of workers to build over 300 concrete structures across the island alone. Nearly 10% of all concrete used on the entire Atlantic Wall went into the Channel Islands.
