The hórreos of A Merca Curiosity · A Merca, Terra de Celanova, Ourense Image of A Merca, not of the place itself. The concello preserves a group of thirty-four hórreos standing together, held to be the largest in the whole Galician territory. Aligned on the same field, they give the measure of the importance cereal had here. Photo: Estevoaei (CC BY-SA 4.0) What to see and do in A Merca