This is the last of my posts (maybe) about our 2015 trip to Finland, read more here.Salpa Line Museum. A portion of a very long string of fortifications intended as a defense against possible Soviet incursions. The swampy lake filled north of Finland offered sufficient natural obstacles, but a very long line of trenches and tank traps were built in the southern part of the border.
Most of the line was left to return to nature, and a hiking trail follows its length. In this spot, however, a few large fortifications remain, and the trenches were shored up. The museum has had to rebuild the wooden retaining walls more than once, a testament to the wet climate.
In addition to these larger permanent bunkers there were the remains of several small gunner positions. These would be buried, of course.
The actual tank fortifications were these teeth like rows of large stones. They were quarried nearby and made into long rows to funnel tanks into bottlenecks at the roads. There were also ditches dug, with a sloping side and a drop off, to flip over tanks that tried to cross them.