This is a large Barrow with Lia Fail standing stone on its summit.
Lia Fail is set in concrete and is therefore able to happily laugh at the wind.
I'm not; so I couldn't.
I didn't manage to stand on top for long before being blown off.
[Fairies] have been seen serenading round the West slope of Tara, dressed in ancient Irish costumes.. these races are warlike and given to making invasions. Long processions of them have been seen going round the King's Chair (an earthwork on which the Kings of Tara are said to have been crowned) and they would appear like soldiers of ancient Ireland in review.
An anecdote from John Boylin, in 'The fairy faith in Celtic Countries' by W Y Evans Wentz (1911).