The Great Colonnade was situated along the main avenue of Apamea and ran for nearly , making it among the longest in the Roman world. It was rebuilt after the original, dating from the Seleucid Empire, was devastated along with the rest of Apamea in the 115 AD earthquake. Reconstruction started immediately and over the course of the second century the city was completely rebuilt, starting with the Great Colonnade. The colonnade was aligned along the north-south axis, making up the city's "cardo maximus". Starting at the city's north gate, the colonnade ran in an uninterrupted straight line to the south gate. The northern third of the colonnade's stretch is marked by a monumental votive column that stood opposite the baths. The colonnade passed through the centre 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. 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 1.24 m on a side and 0.47 m high. The columns display two main designs: plain and distinctive spiral-flutes. Archaeologist Jean Lassus argues that the former dates back to the Trajanic period, while the latter to that of Antoninus Pius. The colonnade's porticoes were paved with extensive mosaics along the full stretch of the colonnade.