Montreal Olympic Stadium and surrounding structures, are but a few notable examples of the city's 20th-century architecture. Pavilions designed for the 1967 International and Universal Exposition, popularly known as Expo 67, featured a wide range of architectural designs. Though most pavilions were temporary structures, several have become landmarks, including Buckminster Fuller's geodesic dome U.S. Pavilion, now the Montreal Biosphere, and Moshe Safdie's striking Habitat 67 apartment complex. The Montreal Metro has public artwork by some of the biggest names in Quebec culture. In 2006 Montreal was named a UNESCO City of Design, only one of three design capitals of the world
The O2 for a further ten years until 2027. The dome-shaped structure, which now houses The O2's Entertainment Avenue and arena, was originally constructed as the Millennium Dome and housed the Millennium Experience, a major exhibition to celebrate the start of the third millennium. The exhibition opened to the public on 1 January 2000 and ran until 31 December 2000; however, the project and exhibition was the subject of considerable political controversy and it did not attract the number of visitors anticipated, leading to recurring financial problems. In popular usage, the dome canopy is often still called The Dome, reflecting the substantial,