Aman Sveti Stefan, Montenegro

An offshore 15th-century fortress village has been transformed into a private-island resort in the Adriatic Sea. The 50-room Aman Sveti Stefan property—and the eight-room Villa Miločer, located on the nearby mainland—serves as an ideal base for exploring Montenegro’s islands and vineyards. ($720 per night during low season; $1,105 per night during high season.) (