An ancient ceremonial site,the Hill of Uisneach is considered by some to be Ireland's most sacred site, as it is regarded as the symbolic center of the Emerald Isle.
Primarily associated with druids and the Celtic Festival of Bealtaine, or the Hill of Uisneach is located at the center of the ancient highway of Slighe Assail and is technically a allotment of four neighboring towns,Ushnagh Hill, Mweelra, and Rathnew,and Kellybrook.
A protected national monument, this location is home to many prehistoric and medieval ruins. It's believed the hill has been the site of some type of human activity for the past 5000 years. Visitors to this national treasure will also find a live-in bard, or who regularly guides walking tours to the various megalithic tombs and faerie forts,explaining the significance of the mythology that informs the landscape.
Source: atlasobscura.com