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What is the tallest skyscraper in the world? - TravelMamas.com
a) Willis Tower (formerly Sears Tower), USA b) Taipei 101, Taiwan c) Burj Khalifa (formerly Burj Dubai), UAE d) Empire State Building, USA TravelMamas.com is a family travel blog that offers tips and guides on vacationing with kids. Find packing lists, destination-based blogs, and so much more!