Foundations and Steel Skeletons
The first step to constructing a skyscraper is digging a big foundation hole. When the Petronas Twin Towers were built in Kuala Lumpur, Malaysia, engineers had to shove massive concrete pillars 60~120 meters into the Earth's bedrock layer. The second step to building a skyscraper is making its steel skeleton. This is just like the frame of a car. Strong iron or metal beams are welded to create long vertical columns. At each floor level, these vertical columns are connected to horizontal beams.