the original concept for a series of interconnected low-rise communities gradually evolved into an idea for two parallel mega-structures, as tall as the Empire

the original concept for a series of interconnected low-rise communities gradually evolved into an idea for two parallel mega-structures, as tall as the Empire State Building, that would extend horizontally for dozens of miles—cf https://de.wikipedia.org/wiki/Prora https://de.wikipedia.org/wiki/Prora qv