In front of El Capitolio

The "Umbilicus Urbis" ("Navel of the city") was the designated centre of Rome from which distances were measured. It was situated in the Forum and the remains exist today as a 2mtre high brick structure with a plaque. The "Milliarium Aureum" ("Golden Milestone") was a gilded monument erected by Augustus Caesar in the Forum. Whether it was the same as the earlier Umbilicus is not clear - nor whether some remains existing and marked as such today in the Forum were part of that monument. Today's Italian "Zero Kilometer Stone" is on Capitoline Hil.

Is located at Clark ?d?m t?r (Adam Clark square), at the Buda abutment of Chain Bridge, below Buda Castle. It is marked by a 3m high limestone sculpture.

A marker exists at ground level in the square facing the main entrance of Notre Dame Cathedral.

A marker exists at ground level just in front of the Iberian (or "Resurrection") gate and chapel linking the north end of Red Square with Manege Square.

The "Milion" was a "mile marker" erected in early 4th century AD in Constantinople as the starting point for measurement of distances in the Byzantine Empire. Originally a building with arch, dome and statues it became a location for imperial ceremonies. It survived until early 16th century when the Ottomans demolished it. Fragments were rediscovered in the mid 1960s and a pillar from it stands in Hagia Sophia Square.

"The kilometre zero point for highways is at Tiananmen Square, just outside the Zhengyangmen Gate. It is marked with a plaque in the ground, with the four cardinal points, four animals, and "Zero Point of Highways, China" in English and Chinese." - Wiki