Few parkingplaces.
There are parking garages but I am still sweating by the idea of not damaging my car and not to be damaged by others in that horrible garage in Bilbao.we never use parkinggarages, besides they are very expensive.
What we do is looking on beforehand on Google maps and look for a more quiet suburb of a city or town or even a bit further in a village as we did in Lisbon to park our car and took public transport.
We paid a small amount to travel from Vila Franca de Xira where we stayed to visit Lisbon and Sintra by commuter train. 3 days by traveling by transport n costed us 15 € each !
Cheaper than driving by car and less stressed driving in those terrible trafficjams and paying parkingfees.
I did it once in the busy town of Viseu. No problem.it takes some preparation but it is worth. We do not mind to walk a couple of kilometers from a quieter suburb with enough parkingplaces into a center.
I also only accept a parkingplace in line behind each other.
Not next to each other, avoiding banging doors to my side of my car. Untill now my car has no blushes ,denses of scratches from parking. And that after two and a half year owning the car. Fingers crossed.
Burgos. Same thing . we parked 3 kms out of the center.