Simon stylites hac merkezi ve manasteri. Located on the top of a hill known as the Wondrous Mountain at a height of 480 m. The site was constructed to accommodate the column of the stylite who adopted the ascetic practice of his famous fifth century predecessor, St. Simeon the Elder. The site was founded in the sixth century and was still an active monastery by the end of the 13th century. The whole complex covers an area of ca. 20.000 square meters. The most important structures of the building are: the column of the saint (I), the octagon (II), the church of the holy trinity (III), the north church (IV), the south church / martyrion of Martha (V), the Baptistery (VI), the tetraconch (VII), the hostel, the main entrance and the atrium. At the centre of the complex remains the rock-cut base of the saintís column, surrounded by an octagonal space. The eastern section hosts three adjacent basilicas. The central church is dedicated to the Holy Trinity and can be considered as the main church of the site due to its direct relationship with the saintís column. To the north is another church that might have functioned in relationship to a baptistery, freestanding further to the north. To the south is the martyrion-church, which has a plan that can be defined as a basilica, yet is defined by the triconch arrangement at its eastern end. This last church is dedicated to Martha, mother of St. Simeon. The first construction phase lasted ten years from 541 to 551, when the rectangular core, the atrium and the baptistery are erected. However, the martyrion church of St. Martha and the tetraconch located at the southwest corner of the octagon are added after the death of St. Martha in 562. The building complex has been transformed into a monastery by the very beginning of the 11th century and has survived at least until the late 1st century. The external western walls are from this late building phase.