I am an historian who has written on the Bronze Age Catastrophes. Krakus Mound appears to be a cousin of Silbury Hill north of Stonehenge. They seem to have been built as refuges against the colossal flooding caused by gigantic tsunamis set off by approaches of Venus. Thus Krakus Mound would date from 2500 to 2150 BC, from shortly after the first approach around 2525 BC to around 2150 BC, shortly after the especially close approach of Venus around 2200 BC. See the articles "Jupiter, Venus, and Velikovsky" and "Venus, Skeleton Key to Stonehenge" at https://www.scientiapress.com. read more