Saudi Arabia has revealed plans for something even more audacious than the Burj Khalifa, for instance, the tallest building in the world. via unexplained-mysteries Saudi Arabia has unveiled plans for a remarkable construction project far beyond the scale of anything seen before. The Middle-East certainly doesn't shy away from building things big; the Burj Khalifa, for instance, is the tallest building in the world - standing over Dubai at an incredible 2,717 ft in height. Now Saudi Arabia has revealed plans for something even more audacious - a horizontal skyscraper consisting of two 1,600ft buildings (that's taller than the Empire State building) running parallel to one another for 75 consecutive miles and with a population exceeding that of a small country. This incredible structure, which would cost over $1 trillion, would essentially be a self-contained city complete with a transportation network, greenhouses for growing food, shops, houses, parks, recreational facilities and