 Complete the following phrase:  The land walls run through the heart of modern Istanbul, with a belt of parkland flanking their course. They are pierced at intervals by modern roads leading westwards out of the city. Many sections were restored during the 1980s, with ficial support from UNESCO, but the restoration program has been criticized for destroying historical evidence, focusing on superficial restoration, the use of inappropriate materials and poor quality of work. This became apparent in the 