Saint-Peter's Dome (Basilica di San Pietro), Rome, Italy (1506-1626). My visit in 1978 (just a week before the death of Pope Paul VI) was an overwhelming experience. Never seen it since, it 's about time.....
Santa Maria da Válega Church, Aveiro, Portugal
st petersburg, smolny convent, architecture
France. Strassbourg Cathedral. "The largest clock you'll probably ever see is inside. It's amazing to watch it working."