Barnatresc urban walks - Barcelona. Hiking Barnatresc organises various urban hiking events all year round in Barcelona, such as the Montjuic Walk. The approximate length of each walk is between 10 and 15 kilometers. The urban walk events are open to participation from all over the world and suitable for all ages, as they are not of a competitive nature.To take part simply be at the place and time of departure of the walk event. You will be given a route map and rules of the event. It's healthy, free and fun.