The Loughcrew passage tombs are situated on the highest hilltops of County Meath and were built by Neolithic societies between 3500 and 3300 BC. I managed to visit one on Slieve na Calliagh, (which means the “mountain of the hag”) the highest hill in County Meath (279m). Sunlight enters the tomb at dawn on equinox days and illuminates the series of carvings inside the tomb.
I think that the place is really interesting but it’s not nearly as popular as Newgrange so it’s much more quiet and less disturbed by crowds of tourists. And that’s always a bonus for me.