Worried about earthquakes? Solution: build a backup city in case of the total immobilization of the main one. Tokyo has recently announced plans for the world's first self-contained duplicate city, replacing government and vital services in the event of an apocalyptic earthquake. A "spare battery for the functioning of the nation", the Integrated Resort, Tourism, Business and BackupCity (IRTBBC) is shopping for sites between Tokyo and Osaka, and would include the world's tallest building (652m) and housing for 50,000 on-site workers. [Arch Daily]
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