The Dumbarton Oaks Research and Study Center in Washington, D.C., administered by Harvard University, is a famed museum and study center specializing in pre-Columbian art, Byzantine studies, and garden history and design. Long known for its museum pavilion, designed by the noted architect Philip Johnson, Dumbarton Oaks sits within one of the most spectacular gardens in America. The founders of Dumbarton Oaks, Mildred and Robert W. Bliss, were important...