Language study and preservation, and participation in other cultural activities such as Celtic music, dance and martial arts forms, are seen as a core part of the tradition. Participation in the living Celtic cultures – the cultures that exist in the "areas in which Celtic languages are actually spoken and in which Celtic traditions have been most faithfully handed down to the present day" – is a vital part of their cultural work and spiritual practice. The protection of Celtic archaeological and sacred sites is important to Celtic Reconstructionists. When construction of the N3 motorway in Ireland threatened to destroy archaeological sites around the Hill of Tara, Celtic Reconstructionists (among others) organized protests and a coordinated ritual of protection.