It is Estonia's second largest glacial erratic (glacier moved bolder) Kabelikivi ("Chapel Rock") is located in Muuga. The bolder is 18.7 m long, 14.9 m wide and 6.4 m high, aboveground volume is 728 m³.
Glaciers once covered all the Baltic States and only left for good in about 10,000-9,000 BC.