Southern Tetrapylon

A tetrapylon is a type of ancient Roman monument of cubic shape, with a gate on each of the four sides: generally it was built on a crossroads. A tetrapylon could take the form of a single building or multiple, separate structures. They were built as landmarks at significant crossroads or geographical 'focal points', as a 'sub-type' of the Roman triumphal arch, or simply as decorative and aesthetically pleasing ornamental archtecture.