Newgrange

Newgrange, originally uploaded by Tak from HK.

Newgrange, the Irish passage tomb built in 3000BC of the stone age, i.e. iron and copper were not yet used by human.

It is a big dome like structure where the stone are moved from distance to built it. Inside of the tomb is complete darkness, except every winter solstice, at 8:58, the sunlight passes through the roof box via the passage reaching the tomb chamber. Interesting!