Great Colonnade at Apamea overhauled drainage system. Justinian's changes included erecting a monumental "tetrastylon" made up of four high columns with a meter-high capitals. The city, was however, later sacked by the Sasanians under Adarmahan. Great Colonnade at Apamea The Great Colonnade at Apamea was the main colonnaded avenue of the ancient city of Apamea in the Orontes River valley in northwestern Syria. It was built in the second century CE after Apamea's devastation in the 115 earthquake. The avenue, which runs for nearly , made up the city's north-south axis, or the "cardo maximus". The monumental colonnade is among the longest and most
Great Colonnade at Palmyra in a northwest-southeast direction towards the "propylaea" of the Temple of Bel. Work on the colonnade started after the completion of the "propylaea" in 175 CE and continued through the beginning of the third-century CE. This section is the widest of the Great Colonnade with a uniform width of for the main street and for the sidewalks. A corner of the "temenos" of the Temple of Nebu was demolished to allow the colonnade an uninterrupted line of sight towards the Monumental Arch from the west and a wider access to the section leading to the Temple of Bel. A "nymphaeum"