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"Located in the Denizli Province of southwestern Turkey, this site is renowned for surreal terraces of hot springs and white travertine pools—nicknamed the 'Cotton Castle' for its cotton-like appearance. Its striking baby-blue thermal pools and otherworldly landscape mesmerize visitors and helped propel it to the top of Slingo's list; it also drew substantial social-media attention, with about 1,264,156 Instagram posts and roughly 71,400 TikTok mentions." - Stacey Leasca Stacey Leasca Stacey Leasca is an award-winning journalist and co-founder of Be a Travel Writer, an online course for the next generation of travel journalists. Her photos, videos, and words have appeared in print or online for Travel + Leisure, Time, Los Angeles Times, Glamour, and many more. You'll usually find her in an airport. If you do see her there, please say hello. Travel + Leisure Editorial Guidelines