ALBAWABA - YouTuber Jimmy Donaldson, popularly known as Mr. Beast, climbed Dubai's Burj Khalifa, the tallest building in the world. A video of him at the top is going viral on social media. "I made it! In the clip, you can hear the YouTuber saying, "I am standing on top of the tallest building in the world." "This is terrifying! I shouldn't have looked down; that's scary," he added. People ...