Stenberga Castle, Medieval castle ruins in Masku, Finland.
Stenberga Castle consists of two stone towers with walls approximately 2 meters thick, built on a steep rocky outcrop. The remains sit elevated near the Hirvijoki River in a strategic position.
The site was first recorded in 1398 under the authority of Turku Castle's bailiff. In the 1430s, stones from here were transported and reused to build a monastery in Naantali.
The ruins reflect how medieval communities built defenses and organized settlements in this region. Visitors can see how the towers once dominated the surrounding landscape and served local populations.
The ruins sit on private land, so you need to ask the owner for permission before visiting. The path up the rocks is steep and uneven, so wear sturdy shoes.
Post-glacial land uplift has pushed the location almost 2 kilometers away from the sea. What was once a fortress on an island now sits inland, a hidden reminder of how the land itself has transformed.
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