The classical city was established on the much larger north hill and to its eastern slope. The excavations, which cover only 1/10 of the city's total area, have revealed a Hippodamian grid plan. Two large avenues were discovered, with an amplitude of 7 meters, along with vertical and horizontal streets that divided the urban area into city blocks. Each one had ten houses with two floors and a paved yard. Very important for the archaeological research are considered the rich villas that were excavated in the aristocratic suburb of the city located in the eastern part of the north hill since there was found some of the earliest floor mosaics in Greek art.