National Geographic : 1956 Oct
© National Geographic Society 464 Castle and Church Sit Like Eagles' Nests Above the City of Sion From its construction in 1294 to its destruction by fire in 1788, the Castle of Tourbillon housed the Bishops of Sion, who answered only to the Pope. Its crenelated walls still command a magnificent view of the valley. At the foot of the twin crags, Sion prizes a cathedral, church, and city hall-all centuries old. Now a center of the wine trade, Sion has a population of more than 10,000.