Cuevas de Zugarramurdi Nature · Zugarramurdi, Baztan-Bidasoa, Navarra A cavity carved by the Olabidea stream in the limestone rock, whose main chamber measures about 100 m long, 20 m wide, and 30 m high. According to tradition, nocturnal witches' akelarres (sabbaths) were held here. Photo: Alberto-g-rovi (CC BY 3.0) What to see and do in Zugarramurdi