Ranked by strength
The 8 strongest castles in Sweden
Sweden’s mightiest fortresses — the strongholds built to hold against siege, ranked by military strength rather than fame. Each links through to its full history, and you can rebuild any of them to explore with AI.
- 1
Sweden · Partial ruin · prime 1604
Bohus Fortress
Bohus Fortress is a medieval fortress on a 40 m cliff beside the Göta River in Kungälv, Bohuslän, Sweden, originally begun in 1308. It was a major Norwegian stronghold, later rebuilt and upgraded into a bastion-style fortress; much of the stonework survives and the site is a museum. The surviving complex includes substantial curtain walls, towers and internal buildings around a compact inner bailey.
- 2
Sweden · Restored · prime 1590
Kalmar Castle
Kalmar Castle is a major Swedish Renaissance castle on the Baltic coast at Kalmar, originally founded as a 12th-century defensive tower and expanded with curtain walls, corner towers and gatehouses. Rebuilt and remodelled most extensively under King Johan III in the late 16th century, it became a royal residence and administrative fortress and later underwent 19th–20th century restorations; today it is a preserved Renaissance castle open to the public.
- 3
Sweden · Ruin · prime 1709
Borgholm Castle
Borgholm Castle is a large Swedish fortress on the island of Öland that was rebuilt as a 17th-century baroque palace and completed in the early 18th century. The palace was gutted by fire in 1806 and today survives as an open ruin managed by the Swedish state, with the inner courtyard used for events and a museum on the site.
- 4
Sweden · Restored · prime 1540
Malmö Castle
Malmö Castle (Malmöhus) is a Renaissance-era brick castle on a small island in Malmö, Sweden, now housing museum collections. The surviving complex includes a long rectangular main building, curtain walls and a surrounding moat, with ancillary buildings such as the Commandant's House and the Castle Mill nearby.
- 5
Sweden · Partial ruin · prime 1600
Nyköping Castle
Nyköping Castle (Nyköpingshus) is a medieval castle in Nyköping, Sweden, originating in the late 12th century and substantially rebuilt into a Renaissance palace at the end of the 16th century. It contains surviving medieval elements including a Gustav Vasa-era round gun tower; parts were later refurbished to house museum exhibits and a restaurant in the former banquet hall and Queen's Cellar.
- 6
Sweden · Still standing · prime 1900
Örebro Castle
Örebro Castle is a stone castle on a small island in the Svartån river in Örebro, Sweden. It originated as a medieval defensive tower, was expanded into a Renaissance residence under the House of Vasa and was finally rebuilt around 1900. Today the building is intact and houses public functions including some school rooms.
- 7
Sweden · Still standing · prime 1620
Vadstena Castle
Vadstena Castle is a 16th–17th century royal castle on the shore of Lake Vättern in Vadstena, Östergötland, Sweden. Built from the 1540s as a fortress and converted into a Renaissance palace, it retains its stone curtain, rounded cannon towers and a tall central roof tower and now houses a museum and archives.
- 8
Sweden · Partial ruin · prime 1660
Visborg
Visborg was a medieval fortress sited on the southwestern edge of Visby on the island of Gotland. Erected under King Erik of Pomerania from about 1411 and later reinforced under Danish rule, it served as Erik's residence and a strategic harbour stronghold until its destruction in 1679. Today only fragments of the castle's walls and foundations survive overlooking Visby harbour.