Mega-projects added to the size throughout the 1990s, including Le 1000 De La Gauchetière (the tallest building in Montreal), Le 1250 René-Lévesque, and the Montreal World Trade Centre.
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Rather, vertical segregation is applied on a piecemeal basis, as in sewers, utility poles, depressed highways, elevated railways, common utility ducts, the extensive complex of underground malls surrounding Tokyo Station and the Ōtemachi subway station, the elevated pedestrian skyway networks of Minneapolis and Calgary, the underground cities of Atlanta and Montreal, and the multilevel streets in Chicago.
In 1971, Lawrence released her first science fiction novel, Andra, about a futuristic society in which the ruler dominates the lives of the citizens of an underground city.
Satellite photos allegedly reveal an underground city and nuclear silos with Ghauri rockets in Al-Sulaiyil, south of the capital Riyadh.
In the 1970s, German foreign correspondent Karl Brugger met "Tatunca Nara", who told him of the history of Akakor, an underground city below the rain forest.