Falles d'Erill la Vall Activity · la Vall de Boí, Alta Ribagorça, Lleida Image of la Vall de Boí, not of the place itself. Descent of the falles (fire torches) of Erill la Vall around 12 July, as part of the Sant Cristòfol main feast, with more than 150 fallaires coming down the mountain with lit torches. UNESCO inscribed this tradition on 1 December 2015, together with that of 62 other villages of the Pyrenees. juliol Photo: José Antonio Gil Martínez from Vigo, Spain (CC BY 2.0) What to see and do in la Vall de Boí