Newgrange, Ireland : A 5000 year old ancient ceremonial center and passage tomb. Crowds flock here every year to witness how the winter solstice light illuminates the interior of the passage and chamber.
Bryn Celli Ddu. is a prehistoric site on the Welsh island of Anglesey located near Llanddaniel Fab. Its name means 'the mound in the dark grove'. The Summer Solstice sun lights up a quartz stone at the back of the chamber.
Considered to be the oldest and most famous prehistoric site in all of Ireland, Newgrange is a tomb that was built from earth, wood, clay, and stone around 3100 BC, some 1000 years before the construction of the pyramids in Egypt. It consists of a long passage that leads to a cross-shaped chamber that was apparently used as a tomb, as it contains stone basins filled with cremated remains.