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"A major reason travelers make their way to Sion, this castle sits atop a hill that towers over the Rhône Valley town—you can’t miss it." - Lydia Mansel Lydia Mansel Lydia Mansel is a writer with more than eight years of experience editing and writing for both brands and online publications—with a particular focus on travel, fashion, and lifestyle. She’s also the founder of the travel site justpacked.com. Travel + Leisure Editorial Guidelines