Domus de Janas (Sardinian: "House of the Fairies" or, alternatively, "House of Witches") are a type of pre-Nuragic rock-cut chamber tomb found in Sardinia. They consist of several chambers quarried out by the people of the San Ciriaco through Ozieri cultures and subsequent cultures, resembling houses in their layout. The shape of the internal chambers can vary from that of a rounded hut with conical or triangular ceiling. The walls are often decorated with reliefs or etchings depicting magical and religious symbols such as spirals, zig-zag motifs and bull's horns.