Stainless steel
Stainless steel is used in the construction of modern buildings, such as the exterior of the Petronas Twin Towers and the Jin Mao Building. The Parliament House of Australia in Canberra has a stainless steel flagpole weighing over . The largest stainless steel building in North America is the aeration building in the Edmonton Composting Facility. La Geode in Paris has a dome composed of 6433 polished stainless steel equilateral triangles that form the sphere that reflects the sky. The development of high-strength stainless steel grades, such as "lean duplex" grades, has led to increasing use in structural applications.