I discovered magical Tuatha De Danann during my visit to the neighboring Mists of Avalon earlier this month. Strange lights appeared in the mists off to the northern horizon. I flow over there, and discovered strange and beautiful lit Tuatha De Danann, a private sim but open for public visitation. The central area, which looks like it can hold dances and other events, has to be one of the most unique places in Second Life. Well worth a visit.
Set your sky at midnight for the best lighting effects.