Great Colonnade at Apamea as part of the intersection. The colonnade was further intersected by side streets at regular intervals of . The colonnade passed through the center of the city and several important buildings were clustered around it, including the baths, the agora, the Temple of Tyche, the nymphaeum, the rotunda, the atrium church and the basilica. The street within the colonnade was wide and paved with large polygonal limestone blocks. On either side of the street a wide colonnade ran its full length. The columns were high and in diameter. They stood on square bases of on a side and high. The
Great Colonnade at Palmyra was later added to the eastern colonnade between the Bel and Nebu temples. The middle colonnade, stretching from east to west, was constructed to connect the two earlier colonnades. Work on the central avenue began from the Monumental Arch, where it met the eastern colonnade, sometime in the early third-century CE. The section stretched until the Great Tetrapylon where it met the western colonnade in an oval plaza. The central colonnade also incorporated the portico of the baths. The central section of the Great Colonnade became the most important with several civic buildings clustered around it, including the caesareum, the