127 of 141VR
I'm particularly happy about finding this spot. On Tyresta's homepage there is a photo from (I suspect) here, showing the two islands that can be seen in the panorama, and I had always wondered where it was taken from but never been able figured it out until now. In this area there are some fairly steep cliffs leading into the water, which made it a good place for set up a hill fort; something the locals did a long time ago in order to have a place to retreat to in times of unrest. I don't know when the fort remnants date from, but it was listed by the government of Sweden in 1668 and is listed as Tyresö 106:1 / Stensjöborg.
The fort covers two hilltops - an eastern and a western - with a narrow notch between them. On each side of the notch the hills, which are basically two big, bare rocks, rise near vertically. It is not difficult to imagine that an attacker would have to fight very hard to successfully assault anyone defending the fort. It was this notch that confused me last time. The western hilltop is slightly lower than the eastern, and the line of sight to the water is obscured by trees. I tried to find a spot where I could see the islands from when I was here the first time. No luck. Moving towards the notch I was faced with a steep rock face, which made me conclude that there was no success to be had in that direction. This time, however, I went north and found a place where one could climb up on the eastern hilltop by following the remnants of the defensive wall up the hill.
As the tracklog shows, it is possible to descend the hilltop to the east. One has to zig-zag among sharp drops and leftovers of walls, but it can be done.