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Tagsgrogarn
1 place carries this tag, across every kind and continent it appears in.
🇸🇪 Sweden · Hillfort
Iron Age (400 BCE–500 CE) · Gotlandic Iron Age
Massive coastal hillfort on Grogarnsberget limestone plateau (65 m) above Katthammarsvik, with 1200 m stone wall 4 m high enclosing 45 ha, double walls at north.