sassenpoort, gatehouse of the zwolle city wall in the netherlands

gatehouse sassenpoort netherlands 1409 natural stone trachyte tuff built rijksmonument top 100 culture cultural sites flag wall weather sky coast sea recreation vacation zwolle city shutters blue white clock lace gold battlements roof history hanseatic league monument monuments canadian soldier liberated tower window jagged overijssel ijsselmeer zwarte meer vechte river