In the 1960s, the late Prince Karim Aga Khan IV bought the Costa Smeralda (Emerald Coast) in northeastern Sardinia, subsequently turning the area into a hot spot for royalty and celebrities.

U.S. News Insider Tip: Design fans will love Costa Smeralda's CoDe Museum. Located on Deck 7, it celebrates the global influence of Italian creativity in an immersive attraction that spotlights ...