From Barcelona take the AP-7 and come off at the exit signposted Caldes de Montbui. Follow the C-59 towards Moiá until you get to Castellterçol. Just as you arrive in Castellterçol take a right turn signposted Castellcir. Do not go into Castellcir but carry straight on until the road turns into a track. Just at this point take a right down a track marked ROCA. Journey time approx 45 mins from central Barcelona.