First mentioned in 1345 chronicles, the Lagarfljót Worm is said to dwell in the glacial lake of the same name, appearing as a serpentine, dragon-like creature that rises in coils above the water. Over the centuries it has been blamed for crop failures and bad luck, with sightings continuing into modern times. In 2012, viral footage appeared to show a long, writhing form moving beneath the lake’s icy surface, reigniting global debate over Iceland’s most famous cryptid.