Next to Eunate, Olcoz is, with church of San Miguel which front is identical to that of Eunate, but the other way round. To explain it, the villagers tell, that the templarios of Eunate, before the absence of his foreman, resorted to one giant stonemason who finished the work. After the teacher returned, abbot punished it, making him construct a comparable work in others three days. With help of witches and snakes, one managed to raise equal but inverse porch, and when the giant saw his work pirated, it struck with such force the porch, which ordered it flying up to Olcoz. Between his civil buildings he emphasizes the palatial tower Gothic that it preserves remains of castellated and large windows with tracerías Gothic.

Chalice of the church of San Miguel is a work of art.