15. The Pyramids of Giza, Egypt
Once isolated in the desert, the Pyramids of Giza have faced new threats from urban sprawl, relentless pollution, and the intense pressures of mass tourism. These ancient wonders were in danger of being engulfed by the modern world. Through modern conservation techniques and strict site management, Egyptian authorities are now working to protect the pyramids for future generations. Explore more about their preservation at Smithsonian Magazine.
