The Burj Khalifa opened on January 4, 2010, claiming the title of the world's tallest building at 828 meters. Bill Baker, the structural engineer, made this possible with his innovative "buttressed core" system. Originally planned at 518 meters, the design grew taller by 310 meters through careful wind-tunnel tests and refinements. This design features a hexagonal central core with three wings extending outward in a Y-shape. This helps the building resist twisting from wind and keeps it stable. Dubai’s extreme heat and desert winds posed big challenges. To fight this, the team tested over 40 wind tunnel models and used 26,000 special cladding panels that reduce heat. The tower stands on a strong concrete base fixed deep into the ground. It also uses modern techniques to protect steel from corrosion caused by salty groundwater. Burj Khalifa was built before "sustainability" became popular, yet it cleverly cuts solar heat by exposing only one-sixth of its surface to direct sunlight at a time. It even collects water from air conditioning condensate, saving water equivalent to 20 Olympic-size pools yearly. Higher floors enjoy cooler, cleaner air making them comfortable despite the desert climate. Fifteen years on, the Burj Khalifa is more than a tall tower; it’s a symbol of ambition and engineering excellence. Bill Baker calls it "a statement of optimism and ambition." The tower reshaped Dubai's skyline and inspired builders worldwide. Its core ideas will influence taller buildings in the future as materials and technology improve. For now, the Burj Khalifa stands strong, safe, and stunning — a true icon of human innovation.