Kastellet

Kastellet is a round fortress with red brick walls located on an islet in Stockholm's harbor and takes up much of the small island's space. The structure displays characteristic military architecture with bastions and interior courtyards that remain visible in their original form today.

The fortress was built in 1667 following a design by Erik Dahlbergh and was originally created to defend the city of Stockholm. After an explosion in 1845, it was completely rebuilt between 1846 and 1848 and has retained its current form since then.

The Swedish Military Ensign is raised and lowered daily at the tower's summit, symbolizing the nation's current peaceful status. This ceremony happens in front of visitors and is part of the site's daily routine.

The fortress is accessible on foot by crossing a bridge or causeway and can be easily reached from the old town area. Visitors should be prepared for weather conditions since the exposed location on the water offers less shelter.

During World War II, the fortress was temporarily converted into an air defense position and equipped with rapid-fire artillery. This was one of the few times the monument was reactivated for its original defensive purpose.