A military structure located near the coordinates in Brittany, France. The provided name 'Feldm. OB Flak' suggests a possible German WWII-era origin (with 'Flak' indicating anti-aircraft artillery), consistent with German fortifications built in occupied France during the war. However, the web search results contain no specific information about this site, its history, or current condition.
No verified details on its construction, purpose, or present state are available from the provided sources.