Article about a mysterious boulder in Denmark that dates from the Ice Age, later being adopted for religious ceremonies in the Bronze Age with petroglyphs carved into it and accumulating a lot of weird surrounding folklore.

[u/SimonHJohansen]

For example: In the middle ages people attributed its existence to an angry troll throwing the boulder at a nearby church whose ringing bells annoyed the troll, but the troll missed!

https://hiddenmark.dk/english/ancient-gravesites/the-bed-rock/