Photos

Before satellites could be used for land surveying, the necessary measurements were made by determining the angles of the triangulation network. In practise, each of these structures needed to be built on the peaks of hills for the ease of being spotted from many directions. In Finland, there were over 4000 of them, the last was built in 1986. Today, only few dozen are still standing. GPS has made these structures unnecessary.

It was almost a miracle that this one was still standing. I remember it from my childhood, since there was a ski track that went nearby. I was less than 9 years old and I would not have wanted to pass this structure at dark. It was scary and fascinating at the same time. It still is a very odd thing to stand next to. In a windy weather it makes noises that remind you of a typical ghost house in movies.

Update (2009-06-07): The tower has finally fallen down. I have no idea when, but it seems to have happen due to "natural causes". At least I didn't see any other explanation. All three "legs" were still fastened on the rock. Images of the current condition:
http://yfrog.com/5h07062009333jx