You don't have to be religious to enjoy the peaceful atmosphere of Sion Cathedral. Inquire when the next service is scheduled or when it's open for general viewing.
Sion Cathedral is an interesting place to start out your day in Sion. This principal church comes recommended by fellow travelers, but it isn't the only spot to see here. Allow time for other sights like Tracouet Gondola, Anzere Ski Resort, and St.Leonard Underground Lake to really enjoy what the area has to offer.