The ruins of Grünenberg Castle, Schnabelburg Castle and Langenstein Castle are a complex of three interconnected castles on a hill above the municipality of Melchnau in the canton of Bern in Switzerland. The three castles formed the center of power of the Barons of Grünenberg in the Oberaargau region during the High Middle Ages.
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Wikipedia https://en.wikipedia.org/wiki/Grünenberg_Castle
Official Website https://www.gruenenberg.ch/
Address 4917, Switzerland
Coordinates 47°10'44.587" N 7°51'30.081" E
