Went for a stretch of the legs into Portugalete & Getxo, the towns closest to the port, with fellow resident Stephen Clarke. Next thing I knew, we had walked 20,000 steps!  Below is Puente de Vizcaya, the world's oldest transporter bridge. Six million people use it to cross the estuary every year. A UNESCO World Heritage site, designed by Alberto de Palacio and opened in 1893. It was a revolutionary work of engineering allowing boats to cross under gondola at the same time on the river Nervion between the towns of Getxo and Portugalete. Very cool! Takes longer to buy a ticket and walk on, then it does to cross.