Dioikitiriou Square (Thessaloniki)

 ancient, archaeological site

In the area of Plateia Dioikitiriou - in the historical center of Thessaloniki - a building square of the city has been discovered with evidence of habitation covering a wide chronological span from Hellenistic to post-Byzantine times. This is the only such architectural unit known in the city. It is strikingly well preserved with building walls standing to a height of 2.80 meters (~9 feet). This urban island lies to the east of a Roman road, 6 meters (~20 feet) wide, which formed one of the main arteries of the perpendicular road network of the city. To date, a dense network of drainage and water supply channels of various types has been found, including the earliest drainage system of Roman times with a stone built vaulted covering.

The nice thing about this find is that they have an area within the dig where you can walk and get an up close view (free). When you step out of here you're back in the modern city and the differences are shocking.