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Storkyrkobadet Hidden Bathhouse - Svartmangatan 20, Stockholm, Sweden

As noted by Atlas Obscura, right in the tourist area of Stockholm there is a small public bath, hiding away in the cellar of a 17th-century building in the Old Town. The bathhouse was created for students when the building became a primary school in the 1890s. A century later a sauna was added and the bathhouse was opened to all. While there has been some controversy over the years, Storkyrkobadet remains open to anyone who can find it.