Trivia: Which building became the tallest in the world when it opened in 1973?
Sears Tower
World Trade Center
Burj Khalifa
Shanghai Tower
Correct Answer: Sears Tower
So why is this answer correct? : At its completion, the Sears Tower stood at 1,454 feet tall with 110 stories and accommodated 15,000 of Sears’ Chicago workers. It held the record for the tallest building until 1996 when the Petronas twin towers in Kuala Lumpur passed it by a mere 29 feet. In 2009, the tower was renamed the Willis Tower after Sears sold it to Willis Group Holdings.