In this week’s episode of “Travels with a Curator,” Xavier F. Salomon, Deputy Director and Peter Jay Sharp Chief Curator, journeys to Siena to explore Santa Maria della Scala, an eleventh-century complex across from the steps of the cathedral. Behind the modest exterior of this hospital turned museum are a variety of magnificent frescoes and sculptures by Lorenzo di Pietro, better known as Vecchietta. The Frick’s “Resurrection” is the only signed and dated work by the artist in the United States.