Mäkkylä's Railway Station lies close reach 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.
Trench are scattered throughout the Mäkkylä, apart of a crescent shaped outpost structure around the Helsinki Metropolitan area, this might be the biggest outpost complex. In Mäkkylä there's two big outpost areas: one command center and heavy defense posts. 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.