ruta turística de arrigorriaga el secreto de las piedras rojas
The tourist route The Secret of the Red Stones is located in the Basque town of Arrigorriaga, just 10 kilometres outside Bilbao, and can be reached via the main transport networks, both by train and by road.
The Renfe railway line has a stop in Arrigorriaga, and this is probably the best way of getting there from Bilbao (getting on at Abando station).
By road, you can see the following interactive map, which uses Google Maps
In addition, there are numerous bus services that will take you to Arrigorriaga.