New Älvsborg - Credit: Wikimedia Commons
New Älvsborg, so-called to distinguish it from the earlier fortress at Old Älvsborg,Both Old Älvsborg and New Älvsborg must also be distinguished from a third fortified site, Älvsborg Fortress. is a sea fort on the island of KyrkogårdsholmenThe name form Kjyrckiegår[dz] Holmen is attested from 1640, and one can assume that at one time there was a graveyard on the island. Källa: Ortnamnen i Göteborgs och Bohus län II : ortnamnen på Göteborgs Stads område (och i Tuve socken) jämte gårds- och kulturhistoriska anteckningar, (Tredje häftet), Hjalmar Lindroth, Institutet för ortnamns- och dialektforskning vid Göteborgs Högskola, Elanders Boktryckeri, Göteborg 1929, s. 142 within the urban area of modern Gothenburg, Sweden. Situated near the mouth of the Göta River, it protected what was at the time of its construction Sweden's only access to the North Sea and the Atlantic Ocean. Construction began in 1653, and the fortress remained in service until 1869, though it only saw significant action in one conflict, the Great Northern War. Read more on Wikipedia
Source: en.wikipedia.org