If your heart is into old things of Yesteryear, you might check on one of the many flea markets that the island of Mallorca holds, every week. You may not find an Old Master, if that is what you are looking for, but just act cool in case you should.
Mercadillos or Rastros are such collectibles markets of old stuff. The biggest flea market is on every Saturday morning in the Avenidas, in Palma. Sunday is the potentially best one, with Encants marketday in the village of Consell. You can also try your luck on Tuesday in Artà, Friday in Llucmajor, Saturday in Campos, or Sunday in Santa Maria del Camí.
The photo was chosen from my archive. It was taken in Campos. The date: August 11th, 2007. The time was 11:51:09.