Hakoinen Castle, Medieval hillfort in Janakkala, Finland.
Hakoinen Castle sits on a steep rock formation that rises about 63 meters (207 feet) above Lake Kernaala in southern Finland. The ruins show what was once a fortified structure with different building materials used at different levels of the hillside.
This fortification was built in the late 13th century as a Swedish stronghold and faced a three-day siege by Novgorodian forces in 1311. The siege represented a major military clash between Swedish and eastern powers in this region.
The castle displays layers of two distinct construction phases that become visible during a visit. The lower sections used wood, while the upper structures were built from stone.
The path up to the castle requires moderate physical effort, and visitors should wear sturdy footwear. Most people need about 45 minutes to explore the ruins and make their way back down.
Archaeological excavations uncovered a single tower positioned at the hilltop that could overlook the entire surrounding area. This tower played a key role in the site's defensive strategy.
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