There is a peculiar dearth of ancient megaliths in northern/central Europe, Holland, Germany, Poland, presumably great land for settlers circa 2000 B.C., when megalithic city-states were prolifically being built in Spain, France, Italy, Greece, Lebanon, and Egypt (some of which are now submerged), so why none in those regions which are now great agricultural countries of northern Europe?
Those lands were covered by Ice Age icepacks at that time (except near the shore), so no building there then, but circa 1300 B.C., the Gutis (Goths), Teutons, and Tirasians began to move into that territory, after the Ice Age icepacks had melted, and began to settle into their "barbaric" hunting/farming village life sans the sophisticated megalithic building.
Those lands were covered by Ice Age icepacks at that time (except near the shore), so no building there then, but circa 1300 B.C., the Gutis (Goths), Teutons, and Tirasians began to move into that territory, after the Ice Age icepacks had melted, and began to settle into their "barbaric" hunting/farming village life sans the sophisticated megalithic building.