when did the roof collapse at the metrodome
Hubert H. Humphrey Metrodome A severe winter storm arrived on December 10–11, 2010, with over 17 inches (43 cm) of snow accumulation, and strong winds; those winds made the roof unsafe for the snow removal crew. As the workers were pulled back, the roof was already sagging in the center. On December 12 at about 5:00 a.m., the roof had a catastrophic collapse as three panels tore open. The night before, a Fox Sports crew setting up for an upcoming Vikings game noticed water leaking from the roof and kept their cameras on all night; those cameras captured the roof tearing and ice and snow falling into the stadium.[40][48] No one was injured. Most of the roof sagged and came to rest on cable stays. The collapse caused no damage inside the stadium aside from a light fixture and some seats. The turf was not damaged; a drainage system designed for cleaning purposes allowed the field to dry out.[49] On December 15, 2010, a fourth panel ripped open, sending more snow and ice into the dome.[50]
World Trade Center (1973–2001) When completed in 1972, 1 World Trade Center became the tallest building in the world for two years, surpassing the Empire State Building after a 40-year reign. The North Tower stood 1,368 feet (417 m) tall and featured a telecommunications antenna or mast that was added at the top of the roof in 1978 and stood 362 feet (110 m) tall. With the 362-foot (110 m)-tall antenna/mast, the highest point of the North Tower reached 1,730 feet (530 m).[89] Chicago's Sears Tower, finished in May 1973, reached 1,450 feet (440 m) at the rooftop.[91] Throughout their existence, the WTC towers had more floors (at 110) than any other building.[89] This number was not surpassed until the advent of the Burj Khalifa, which opened in 2010.[92][93] Each tower had a total mass of around 500,000 tons.[94]