Possible Clues:

• See 62-Across
• 'When in . . . ., do as . . . . does'
• HBO series set in the first century B.C.
• Baking-apple variety
• See 40-Across
• Georgia city built on seven hills
• Where da Vinci Airport is
• Caesar's capital
• Piazza Navona site
• Pantheon's place