The sheer size of some of the world's tallest buildings is just extraordinary. The current tallest, Guinness World Records reports, is the Burj Khalifa in Dubai, which stands at 2,716 feet, 6 inches ...

Take a tour of some of the biggest equipment in the world. Massive machines, incredible engineering, and a behind-the-scenes look at industrial power. Vance confirms no deal with Iran after 21 hours ...