Castle Elfsborg        

Gothenburg, Sweden              
Elfsborg Castle, also known as Alvsborg Castle, sits on an island at the mouth of the Gota Alv River at Gothenburg's harbor, the gateway to Sweden's access to the Atlantic. Up until the mid-1650's Gothenburg was Sweden's only city on the Atlantic, as the coast to the north was owned by Norway, to the south by Denmark.

Various fortifications had existed in the immediate area since the 13th century (all of which destroyed by the Danes), but this current fortification ("New Alvsborg Castle") was built in the late 1600's.

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Castle Elfsborg?
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Info Source
Thanks to Google Maps for the image!