Balboa Park has been around for more than a hundred years. But the Balboa Park we know today began with the 1915 Panama-California Exposition. The park has had a rich history, and now it’s a charming destination for tourists and locals. Culturally and emotionally, Balboa Park is the heart of San Diego. During this anniversary year of the exposition, KPBS looks at the park's history, its treasures, and the challenges it faces.