Discover historic fortresses in West Sweden

Strongholds that have stood firm through the centuries

West Sweden is home to many historic castles and fortresses that played a key role in Sweden’s defence and security. From Bohus Fortress beside the Göta River to Karlsborg Fortress on the shores of Lake Vättern.

Bohus Fortress – guardian of the Göta River

Bohus Fortress is one of West Sweden’s most impressive ruins, offering dramatic views across the Göta River, historical guided tours, and medieval events within the fortress walls.

The fortress that never fell

Construction of Bohus Fortress began in 1308 under the Norwegian king Haakon V Magnusson, built to secure Norway’s southern border. Over the centuries, the fortress was strengthened by both Norwegian and Danish rulers and endured numerous sieges without ever falling.
Only after the Treaty of Roskilde in 1658, when Bohuslän became part of Sweden, did the fortress lose its strategic importance. It was later used primarily as a prison and a quarry.

Fun facts about Bohus Fortress

The fortress endured no fewer than 14 sieges but was never successfully captured.
During a siege in 1566, Swedish forces managed to take the so-called Red Tower. The Norwegians, who controlled the fortress at the time, blew up the tower, ensuring that Bohus remained Norwegian for almost another century.
Bohus Fortress was used as a prison for nearly 500 years.

Things to do at the fortress

There are plenty of family-friendly activities, including tug-of-war, bouncy castles, archery, and a tournament horse running on rails.
Join a historical guided tour or explore the fortress on your own with a digital guide — all you need is a mobile phone.
Visit the dungeons... if you dare.
Throughout the year, the fortress hosts a wide range of events, including Midsummer celebrations, concerts, medieval days, Halloween events, and Christmas markets. See the events calendar for current listings.

Visit Bohus Fortress

Karlsborg Fortress – Sweden’s reserve capital

Karlsborg Fortress was once intended to serve as Sweden’s reserve capital. Today, it is a fascinating destination for the whole family, with guided tours, museums, and impressive architecture.

The fortress that took a lifetime to build

After the loss of Finland in 1809, Sweden adopted a new defence strategy in which parliament, government, and the royal family could retreat to a central, protected location in times of war. The chosen site was the Vanäs peninsula on the shores of Lake Vättern, where construction of Karlsborg Fortress began in 1819.
The fortress was originally expected to take ten years to build, but construction ultimately lasted for 90 years. Despite its scale and strategic location, Karlsborg Fortress was never used as a wartime seat of government, although it continued to serve a military function well into the modern era.

Fun facts about Karlsborg Fortress

The fortress is one of Europe’s largest buildings and was constructed mainly from limestone transported across Lake Vättern from Omberg.
The impressive Garrison Church was originally intended as an assembly hall for the Swedish parliament. One of the church chandeliers is made from 276 bayonets and weighs around 500 kilograms.
Today, the fortress remains a living part of the town, with private homes and several small cafés within the fortress area.

Things to do at the fortress

Join a guided adventure tour through the fortress, exploring hidden passageways, dramatic architecture, and centuries of history, with both shorter and longer tours available.
Visit the Fortress Museum and step deeper into the military history of Karlsborg Fortress, from cavalry regiments to paratroopers.
Try one of the fortress Mission Rooms — historical escape-room experiences inspired by the site’s history.
Step inside the beautiful Garrison Church.
Walk through the fortress and continue out towards the Vanäs peninsula and its lighthouse, standing on a small island just offshore. It’s a remarkably beautiful spot.

Visit Karlsborg Fortress

Carlsten Fortress – the pride of Marstrand

Carlsten Fortress towers above the island of Marstrand in Bohuslän, drawing visitors with captivating stories, historical exhibitions, and sweeping views across the sea as far as Denmark.

The notorious prison of the archipelago

After Marstrand became part of Sweden under the Treaty of Roskilde in 1658, construction of Carlsten Fortress began on the orders of King Charles X Gustav. The fortress was built in stages over almost 200 years.
The fortress also served as a notorious prison, holding prisoners including the infamous criminal Lasse-Maja. In 1882, Carlsten Fortress lost its military function, but its history lives on within the stone walls today.

Fun facts about Carlsten Fortress

Although the fortress is officially called Carlsten Fortress, many people simply refer to it as Marstrand Fortress. The name Carlsten comes from King Charles X Gustav.
The fortress was attacked twice, in 1677 and 1719. On both occasions it fell into enemy hands, but was later returned to Sweden through negotiations.
The notorious thief Lasse-Maja served his sentence here before eventually being pardoned by the king after 26 years in prison. For many years, Lasse-Maja avoided capture by disguising himself as a woman.

Things to do at the fortress

Join a guided tour through the fortress and step into stories of prisoners, soldiers, and the harsh daily life behind the fortress walls.
Every year, the Fortress Games bring historical experiences, cannon fire, and musket smoke to Marstrand.
Carlsten’s waffle café is open throughout the summer season.
If you would like to stay overnight, you can check in at Carlsten’s Soldat Hotel.
Take the opportunity to walk around the island of Marstrand and discover Smugglarrännan (Smuggler’s Gorge), Trollskogen (The Troll Forest), Näckrosdammen (the Water Lily Pond), and the island’s elegant historic villas.

Visit Carlsten Fortress

Discover More of West Sweden's Fascinating History

West Sweden is home to a wealth of historic places, each offering beautiful architecture and captivating stories from the past. Step back in time as you explore castles, museums, historic industrial sites, table mountains and charming old town centres – each revealing a different chapter of the region's rich cultural heritage.

Laatst bijgewerkt op: 25 June 2026