1) Obelisk in Istanbul 
The Milion (Μίλ(λ)ιον), was a mile-marker monument erected in the early 4th century AD in Constantinople (modern-day Istanbul, Turkey). It was the starting-place for measurement of distances for all the roads leading to the cities of the Byzantine Empire and had the same function as the Milliarium Aureum of Rome. The domed building of the M...