The setting of the Historic Areas of Istanbul and the outstanding silhouette of the city are vulnerable to development. The setting and distinctive skyline of the Historic Peninsula continues to express the Outstanding Universal Value of the property. Protection and management requirementsThe Historic Areas of Istanbul is legally protected through national conservation legislation. The impressive skyline of the Historic Peninsula with the Topkapı Palace, Hagia Sophia and Süleymaniye is preserved by planning measures. Finding a balance between change and preservation is a delicate issue in the Historic Areas.