Lahti. And the suburb of Kivistönmäki, just a kilometer and half from the center. There's a hill as the name ("stone hill") says, there's a water tower... and there are indeed stones. And a small cliff. Right on the cliff is a "devil's nest", Pirunpesä. Small but interesting cave. There's a nice route through the cave with some climbing involved to get from main, larger cave part and the bottom entrance to the upper level and upper entrance through a narrow passage.
The coordinates are N 60.99146 E 25.67479. Here are some other articles about this place:
Photo of the path to the upper level:
And the lower entrance from inside:
I did a 3D scan of the cave, and converted it to a map as well use cave-outliner. Here's the 3D model in GLB format: link. You can rotate it on your browser screen using this: link. A snapshot of the model and the map are shown below:
A high-resolution PDF version of the map is here: link.
There's also -- as far as I could determine -- two small side caves. The first one I call the balcony cave, with a little wall built into it by the local kids. This cave sits on a ledge on the cliff, covered by rock and was maybe 2 meters wide, though there was some additional crack as well but maybe too narrow for a human. Coordinates N 60.991786 E 25.674635.
Photo:
The second side cave was a nicely arching mini-cave, maybe just 1.5 meters. Coordinates N 60.992001 E 25.6744186.
Photo:
There might have been additional places too, I did not have time to investigate everything.
More photos, the main cave, first with the inside view:
This article has also been published at Planetcaver.net here. Read the full Planetskier series at planetskier.net, urban exploration stories from theurbanexplorer.net, and other underground stories from planetcaver.net, or all blog articles from Blogspot. Photos and text (c) 2026 by Jari Arkko. All rights reserved.
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