WW1 trench in Kannelmäki, Helsinki, Finland

First World War trench in base XX:4 in [Krepost Sveaborg](https://en.wikipedia.org/wiki/Krepost_Sveaborg) land front defense line in Rumpupolunpuisto, Kannelmäki, Helsinki, Finland. The base was built in 1915 - 1918. The whole base contains: * 140 meters of thrench * 3 observation positions * 3 machine gun positions * 4 shelter rooms More info: * [Location in Google Maps](https://goo.gl/maps/DnRD1rC6WHR2ZtXZ8) * [Wikipedia: Krepost Sveaborg](https://en.wikipedia.org/wiki/Krepost_Sveaborg) * [John Lagerstedt , Markku Saari: Krepost Sveaborg](http://www.novision.fi/viapori/eavaus.htm) * [Finnish Heritage Agency site info](https://www.kyppi.fi/to.aspx?id=112.1000013751) (only in finnish)