Olympic Stadium Montreal (1976)

Montreal's Olympic Stadium is a $1.5 billion cautionary tale, its retractable roof never working properly and its tower unfinished until 1987, three decades before the debt cleared in 2006. The design's engineering flaws made it 45% more expensive to maintain than the typical Olympic venue, and it outperforms #1 Millennium Dome in longevity of failure—thirty years of financial burden versus the Dome's single year of infamy. The stadium's endless construction delays and unusable roof prove that style without function creates a permanent albatross.