In Kerimäki, about a 15-minute walk from downtown, has an exhibition on military history entitled ”At the last line”. The exhibition is owned and run by the Herttua Hotel. The hotel yard has fortifications that were part of the Salpa Line and that have partially been restored. The Salpa Line was built from 1940 to 1944 as a defence line for eastern Finland. At the time, it was the largest construction site in the history of the country. It also had bunkers as living quarters, machine-gun nests, gun emplacements and 350 km of trenches.

In addition to fortifications, the exhibition contains guns and a tank located in the yard and two exhibition rooms indoors. One of the rooms displays wartime equipment and military events using maps, photographs and artefacts. The other room shows the impact war had on the civilian population. It has Finnish goods and utility items from the era of the Great Depression.