Charleston has one official sister city, <answer>Spoleto</answer>, Umbria, Italy. The relationship between the two cities began when Pulitzer Prize-winning Italian composer Gian Carlo Menotti selected Charleston as the city to host the American version of <answer>Spoleto</answer>'s annual Festival of Two Worlds. "Looking for a city that would provide the charm of <answer>Spoleto</answer>, as well as its wealth of theaters, churches, and other performance spaces, they selected Charleston, South Carolina, as the ideal location. The historic city provided a perfect fit: intimate enough that the Festival would captivate the entire city, yet cosmopolitan enough to provide an enthusiastic audience and robust infrastructure."
What is the name of Charleston's sister city?
Spoleto