Gallery: Supertall! Exhibit At the Skyscraper Museum Celebrates the Wor...

Wind tunnel and seismic testing, sturdier frames, extraordinary safety measures, specialized elevators, air permits -- these monsters are in a class of their own. Not to mention the financial undertaking each project requires to get it up and running.
Wind tunnel and seismic testing, sturdier frames, extraordinary safety measures, specialized elevators, air permits -- these monsters are in a class of their own. Not to mention the financial undertaking each project requires to get it up and running.

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