Next to the Turunväylä lies a local outside museum. The nature area hides away a huge man-made structures of defense lines, that has been made in the 1 World War Period. The most famous fortification area that has a dome-covered lookout-post.
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Trench are lined up with the main road, it's apart of a crescent shaped outpost structure around the Helsinki Metropolitan area. Make sure that you take consideration of dangers before heading to the sites.
Terrain is really rocky, good shoes are required. Be careful on the site, trenches are some places pretty deep, danger to fall is possible.