Kaali Crater

The Kaali crater field, on the island of Saaremaa in Estonia, consists of nine craters formed by the fragmentation of a single meteorite, the largest of which is about 110 metres in diameter and now holds a small circular lake. Unlike most meteorite craters, which formed so long ago that no human witnesses could have recorded them, the Kaali impact is dated by most researchers to within roughly the last 7,500 years, with some estimates placing it as recently as around 1500–400 BCE — potentially within the timeframe of human settlement in the region, raising the possibility that the impact event itself was witnessed.

This possibility has led some researchers to connect the Kaali impact to widespread mythological motifs in Baltic, Finnic, and broader Northern European tradition involving a "sun" that fell from the sky, was captured, hidden, or had to be rescued — including episodes in the Finnish national epic Kalevala describing the sun and moon being stolen and hidden inside a mountain. The crater site itself shows evidence of having been used for ritual purposes for an extended period after the impact: archaeological excavations have found a fortified settlement and what appears to be a sacrificial site near the crater's rim dating to the Late Bronze Age and Iron Age, including large quantities of animal bones, suggesting the crater was treated as a sacred site by local communities for many centuries — though whether this reverence stemmed from inherited memory of the impact itself, or developed independently around an already-mysterious lake-filled depression, cannot be determined with certainty.