Avicii Arena was the largest spherical building on Earth until September 29, 2023 and took two and a half years to build. [5] It has a diameter of 110 metres (360 ft) and an inner height of 85 metres (279 ft). The volume of the building is 605,000 cubic metres (21,400,000 cu ft) and it has a seating capacity of 16,000 spectators for shows and ...