Smoo Cave, located in Durness, Scotland, is a cool combo of sea and freshwater caves. The name "Smoo" probably comes from the Norse word for a hiding place. The cave formed in dolomites and has a mix of sea-carved chambers and rainwater-dissolved passages. It's got a big entrance chamber, a waterfall, and even some archaeological finds from Neolithic and Viking times. Plus, it's a popular spot for tourists with plans to make it even more visitor-friendly. So, if you're ever in the area, don't miss checking out this unique cave with a bit of history thrown in!