Short answers, pulled from the story.
French architect Roger Taillibert designed the Olympic Stadium in Montreal. He proposed a facility featuring a retractable roof suspended from a massive inclined tower that stands 175 meters tall and is angled at 45 degrees.
Construction began shortly after Montreal won the bid to host the Games with an original target completion date of 1972. The stadium opened for the Olympics in September 1976 while the inclined tower and retractable roof system finally opened in 1987.
Initial projections estimated C$134 million for construction but final costs reached C$1.1 billion by the time the facility opened. Total expenditure including repairs and interest climbed to C$1.61 billion making it one of the most expensive stadiums ever built at that time.
Quebec introduced a special tobacco tax in May 1976 specifically to recoup the massive investment made in the stadium. This levy continued for decades until mid-November 2006 when stadium costs were finally settled more than 30 years after opening.
Frontman James Hetfield was accidentally burned by improper pyrotechnics during Metallica's set forcing the band to cut their performance short. An estimated 2,000 people began rioting within the stadium and surrounding areas causing approximately $600,000 in damage.