- hradloket.cz en/
- liquisearch.com baltiysk/landmarks...Swedes in 1626, completed by the Prussians in 1670, renovated in 1870 and currently holding a naval museum; the ruins of the 13th-century Lochstadt Castle...
- edinburghcastle.scot the-castle
- dictionary.sensagent.com Ordensburg/en-en/While a normal castle in the Reich would control about 38 km², a castle would control 370 km² in Prussia and 789 km² in Livonia, Courland and Estonia.
- awoiaf.westeros.org index.php/Battle_of_Castle_…
- everipedia.org wiki/lang_en/OrdensburgOrdensburgs (plural in German: Ordensburgen, literally: castles of orders ) were fortresses built by crusading German military orders during the Middle Ages.