A canal connecting two oceans through one of the most hostile jungles on earth, a skyscraper that came to define the world’s most iconic skyline, a sea defense system that saved a country, and 6 more Megaprojects that pushed the limits of engineering and became Wonders of the World. Built across more than a century, these creations permanently changed the landscapes, economies, and lives of everyone around them. The American Society of Civil Engineers in 1994 and the BBC in 2003 designated these structures as the greatest engineering wonders of the modern world.