We drove from Santiago to Fatima (Portugal) last year, no passports required. Funny thing was we flew from US to France, walked into and across Spain, drove to Portugal and back to Spain, took a train to France, and our return flight from France went through Germany ? (not sure why, wrong direction). My passport got stamped when we arrived in France, stamped again because we changed planes in Germany, and then back home in USA. Visited 3 countries when we were in Europe and I got a Germany stamp in my passport because of a 2 hour layover there
Never got out of the airport