Carlsten Fortress

Carlsten Fortress is a stone fortification on Marstrand Island that rises from a rocky hilltop, featuring a circular tower approximately 40 meters tall. Defensive walls surround the central structure, creating a compact defensive complex.

King Charles X Gustav commissioned the fortress in 1658 following Sweden's acquisition of the Bohuslän region through the Treaty of Roskilde. The stronghold was strategically built to defend the newly gained territories.

The fortress served as a prison for male inmates assigned to hard labor, with the notable prisoner Lasse-Maja eventually becoming the kitchen chef. His story remains part of the place's local memory and visitor discussions today.

You can reach the site by bus from Gothenburg or by ferry, with travel time depending on your chosen transport. Guided tours are available to explain the military design and historical significance of the complex.

The fortress offers overnight stays in former soldier barracks dating from the 1800s, where guests experience medieval-style dinners served on wooden plates. This creates an unusual way to spend time within the historical walls.

Location: Kungälv Municipality

Inception: 1658

Founders: Charles X Gustav of Sweden

Address: Carlstens fästning, 442 67 Marstrand, Sweden

Phone: +4630361167

Website: https://carlsten.se

GPS coordinates: 57.88611,11.57833

Latest update: December 6, 2025 16:01