The Mayo (May tree) of Vallecillo Curiosity · Vallecillo, Sahagún, León Image of Vallecillo, not of the place itself. Between 30 April and 1 May the young men cut a tree in the woodland and plant it in the village following a ritual fixed by custom, one of the mayos that survive on the León plain. Photo: No machine-readable author provided. Tanq~commonswiki assumed (based on copyright claims). (Public domain) What to see and do in Vallecillo