Festivities of Grisel Activity · Grisel, Tarazona y el Moncayo, Zaragoza Image of Grisel, not of the place itself. Grisel, with a population mostly Muslim until the conversions of the 16th century and the expulsion of the Moriscos in the 17th, preserves a restored 15th-century castle and a Mudéjar parish church of the same century; the Pozo de los Aines sinkhole opens within its district. Photo: Eloy Cotallo (Public domain) What to see and do in Grisel