On the beach strip north of Łeba, reached by cycling or walking along the beach road, lies a strange collection of concrete bunkers, launch ramps, and testing infrastructure dating from the Second World War. The German military established a secret weapons testing range here in 1940, using the deserted coastline to trial radio-guided bombs and early missiles away from Allied surveillance.
The site is now an open-air museum. The concrete structures are still standing — remarkably preserved given the salt air — and information boards explain what was tested here and how the weapons worked. The isolation that made the site useful to the Nazis is now the quality that makes visiting it atmospheric: you're standing in dunes with the Baltic behind you, surrounded by heavy concrete, in a place most visitors to Łeba never find. The beach itself is excellent if you want to combine the history with a swim.