No other construction material can match steel’s suitability for bridging long spans and realising unusual building geometries. “Slender. High. Long – Steel and Steel-Composite Structures” documents outstanding high-rise buildings and engineering structures in steel. This includes not only bridges, sports facilities, factories and exhibition halls but also administration and cultural buildings, such as the Oodi Central Library in Helsinki, the Adidas Arena in Herzogenaurach and the large-scale, accessible sculpture, The Vessel, in New York. In extensive text and expressive drawings, the engineers involved in their design explain the concepts of the steel and steel-composite structures and the solutions they found for realising them.