Milan Cathedral (Duomo di Milano) is the cathedral church of Milan, Italy. The Gothic cathedral took nearly six centuries to complete (groundbreaking was in 1386 and it was completed in 1965). It is the fifth largest cathedral in the world.
Milan. On the floor near the main entrance is a sundial, engraved with zodiac symbols, installed in 1768 by astronomers from the Accademia di Brera, placed so that it is struck by a ray of sunlight breaking through a hole in the opposite wall. On the summer solstice, the ray strikes the tongue of bronze set in the floor; on the winter solstice, the ray of light stretches out to reach the meridian.