Define Megalith. How do historians explain the building of megaliths in prehistoric times?

The megaliths can simply be defined as large stones that are forming a monument from the prehistory, or are part of a monument of the prehistory. There are numerous megaliths found around the globe, with some being more famous than others, such as Gobekle Tepe and Stonehenge. All of the megaliths are surrounded in mystery, as the historians still can not provide proper answers about their building, or the transportation of these stones, as they have been brought from areas far away from where they have been built. The main theories are that they have been built fro either astronomical purposes, or for religious purposes. The transportation of these stones is still subject of hot debate, with theories that wood has been used for their transportation, the rivers have been used (where there are rivers), some technology that still has not be defined about this period of time.