My contribution for this weeks photo challenge : Convergence.
Geometry that forms part of the buttress for the Milan Cathedral. It is the largest cathedral in Italy (fifth largest in the world) and took almost 600 years to complete. This photo was taken on the roof which you can visit for a small fee. Amazingly it has an elevator if steps are not for you!
A photo below of the Cathedral itself. It is quite a sight in Milan and is literally at the centre of the city with streets radiating from it or encircling it.