The paper aims to clarify the dangers and threats of informal urban expansion as well as various aspects of physical & economic development of Giza city, which is located only a few kilometers south of Cairo, and next to one of the most important heritage sites in Egypt and the World which is the pyramids area. The paper also discuses the role of the State in stopping the growth of informal settlements closed to the Pyramids and in safeguarding them. Heritage is our legacy from the past, what we live with today and what we pass on to future. World heritage sites belong to all the peoples of the world. Egypt is a country rich of monuments, heritage buildings and sites from different periods like ancient Egypt, Romans, Coptic and Islam. Egypt contains the Giza pyramids which are considered among the seven wonders of the World. Thus, the sustainable development plan for Giza city, like any other city that has heritage sites must include the preservation of its monuments which are considered irreplaceable( nonrenewable) sources and safeguarding them for the future generations in all the World. The problem is: Most Egyptian cities suffer, over the past four decades, from the rapid informal urbanization caused mainly from the villages migration to the cities specially the big ones like Cairo, Alexandria, Giza, as a result of the concentration of economic activities, services, and job opportunities in these cities. The growth of Giza city -our case study- is uncontrolled and the informal settlements become very close to the monument area of the pyramids, causing environmental and visual pollution which affects the Pyramids area as well as the future of the tourism. The paper will show successful experiments of some countries to safeguard their monuments or heritage sites. It also presents the threats around the pyramids area; by following the development of Giza city from a small village in the beginning of the 20th century into a big city now. The paper also introduces the results of interviews with specialists in the field of planning, archeology and several others. The results of the study show the pollution and urban sprawl problems that exists around the pyramids area and how to deal with them.