Kaali is a group of 9 meteorite craters located on the Estonian island of Saaremaa. Formed in the 7th century BCE, it is one of the most recent craters created by an impact event and the only known major impact event that has occurred in a populated area.Prior to the 1930s, the main crater was thought to have been a volcanic caldera. Its meteoritic origins were first conclusively demonstrated by Ivan Reinvald in 1937.There are souvenir shop, Kaali tavern, museum and Kõljala manor close by.[iframe http://www.tourism360.net/pano/kaali/ 645 350]