The 'stumbling stone' memorial cobblestones that are placed outside residences of victims of the Nazi camps are also being placed in towns and cities in Spain:
As many as 15,000 Spaniards were deported to Nazi concentration camps during World War II.
Their refugee stories are especially complicated, because many of them had initially escaped Franco's takeover during the civil war by fleeing to France - where they were involved, voluntarily or not, in the French resistance to German occupation early in WWII, and then were deported by Franco's forces in reprisal for fighting against the Nazis.
People in the forum here have posted about stumbling stones they've seen outside of Germany, but I don't recall anyone mentioning noticing them in Spain. Have you had them come across your radar?
"By recognizing non-Jewish political prisoners during World War II, Stolpersteine cements Spain’s partnership with the Nazis into the ground people walk on, demonstrating how a dark history can be brought into the light of day. The first memorials in Spain were placed in the small town of Navàs, about an hour north of Barcelona, in 2015.
The project has grown in the past seven years to commemorate more than 600 Spanish men and women in 96 cities and towns scattered across the country."