This lecture explains the latest developments in skyscraper design, focusing on supertall and megatall buildings across the world. It introduces key examples such as Taipei 101 by C.Y. Lee & Partners, Hearst Tower by Norman Foster, New York Times Building by Renzo Piano, Torre Reforma by LBR&A, Lakhta Center by Tony Kettle, Ping An Finance Centre by KPF, and Merdeka 118 by Fender Katsalidis. The lecture discusses important ideas such as advanced structural systems (mega-columns, diagrids, tuned mass dampers), earthquake and wind resistance, and energy-efficient design. It also introduces concepts like LEED certification, high-performance façades, public spaces (POPS), and the growing use of smart technologies, AI, and IoT systems in tall buildings. Overall, the lecture helps students understand how modern skyscrapers combine height, safety, sustainability, and technology in contemporary architecture.