📜 Last remaining ERSTA artillery battery, a Cold War defense system.
🔍 Located on Öja island, Nynäshamn S, Sweden.
🛡️ Explore advanced Cold War military technology
🗺️ See the only remaining ERSTA battery
⛰️ Discover a hidden subterranean facility
🚶 Guided tours available, check website for more information.
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