On this incredible day, we will visit Bilbao and Castro Urdiales, two vibrant cities rich in history and culture. Upon arrival, you'll embark on a 2.5-hour guided tour through the charming Old Town. Strolling through its lively streets, you'll discover architectural gems such as the Gothic Cathedral of Santiago and the beautiful Church of San Nicolás. Continuing along the promenade of the Nervión River up to Guggenheim Museum—a true icon...