circa 2500 BCE — construction of Stonehenge begins

Hundreds of years before the dawn of history
Lived a strange race of people… the Druids

No one knows who they were or what they were doing
But their legacy remains
Hewn into the living rock… Of Stonehenge!

Stonehenge was constructed out of massive slabs of bluestone, by persons unknown using means unknown for reasons unknown, on a field on Salisbury Plain, in Wiltshire, England.

Theories abound as to its purpose, although as the lyrics above suggest, it is generally believed to have been something druidic. Suggestions include it being a burial ground, a primitive observatory, or a place for human sacrifice. Less likely theories argue that it was constructed by Atlanteans or aliens.