The other day I packed a picnic lunch and we traveled 15 minutes up the freeway to the Mission San Xavier del Bac, the White Dove of the Desert. When you drive along the freeway, it’s hard to miss this striking white building with stone carvings. Built in the 1700’s, it is still used today for Mass. It’s incredibly ornate inside. Mark liked all the gold. I liked the history, art, and architecture. What’s the oldest structure you have visited in the United States? This is the oldest one for us.