Newgrange day!
It’s a huge mound older than Stonehenge, which is a tomb but also maybe more, oooooh.
You drive up to a museum/exhibit building, which talks about the area and the tomb, and you can get your tour tickets. You can’t get to the tomb except through the tour.
Then there’s quite a, lovely, jaunt to walk to some buses, which take you to the mound.
Here’s the wiki, if you’re really curious: http://en.wikipedia.org/wiki/Newgrange
Newgrange~!