Apamea, Syria

Cardo Maximus
The Cardo Maximus of Apamea, Syria ran through the center of the city directly from North to South, linked the principal gates of the city, and was originally surrounded by 1200 columns with unique spiral fluting, each subsequent column spiraling in the opposite direction. The thoroughfare was about 1.85 kilometers long and 37 meters wide, as it was used for wheeled transport. The great colonnade was erected in the 2nd century and it was still standing until the 12th. The earthquakes of 1157 and 1170 demolished the colonnade. The cardo was lined on both sides with civic and religious buildings.
http://en.wikipedia.org/wiki/Apamea_(Syria)