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 ...

Image Credit: U.S. Department of Defense, Public Domain/Wiki Commons. Across land, sea, and sky, the biggest war machines ever built were feats of engineering; statements of power. From battleships ...

WASHINGTON, D.C. -- Two of the largest machines ever conceived by scientists will be described today by one of the world's leading experts on particle colliders, the massive and expensive machines ...