Cave of the Sun

Solar Timeline Update (or back date)

All the way back to 3000BC – in what is now Newgrange, Ireland

In Gaelic it was called Uaimh na Greine – the “cave of the Sun.” The builders designed it so on a winter solstice the sunlight perfectly aligns with an opening in the structure to illuminate the inner chamber.

It is the oldest known structure with evidence of scientific thought.

Not really solar energy, but still really cool!