Archaeologists studying crannogs, constructed islands in the Scottish lochs, have found evidence that suggests that these islands are far older than originally believed.
Originally, the crannogs had been dated to approximately 800 B.C. Newer investigations point to an origin of roughly 3640-3360 B.C., or more than 5,500 years ago. The crannogs are constructed from immense rocks, some of which weigh more than 550 pounds individually. The level of labor required to construct these islands points to their significance to these prehistoric peoples.