Memorabilia from the wreck of the Lusitania are among the best artifacts in the Kinsale Museum, which is in a 17th-century, Dutch-style courthouse. The 1915 inquest into that ship's sinking took place in the courtroom, briefly making it the focus of the world's attention; it has been preserved as a memorial. Because the staff consists of volunteers, it's best to call to confirm opening times.
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