The early Christian complex is located next to the building of the Archaeological Museum in Sandanski, in the center. It is an architectural monument of culture from antiquity of national importance. Its opening took place in 1967 by Professor Alexandra Milcheva. On the territory of the complex are located the three-nave basilica with stoa, antrium and well. In the western part of the complex is the view of the ancient main street of the city – Cardo Maximus. It was covered with beautiful granite blocks and typical of Particopolis had drainage channels. Impressive columns connected by arches rose around the street, and one of them still reads an inscription from the time of Emperor Caracalla.