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"Near Whitehall, one of the largest known limestone caverns in the Northwest offers a very impressive two‑hour tour that showcases dramatic underground formations." - 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