The Burj Khalifa already holds the record as the tallest tower on Earth — but engineers say it could be built even higher. This documentary explores how.

The Oz-like Burj Khalifa in Dubai officially opened today, succeeding Taipei 101 as the world’s tallest building. There is no disputing its preposterous height: At 169 stories, or 2,717 feet, the $1.5 ...