Actually, the very first skyscaper in the world was the Eiffel tower. It was built for the 1870(?) Worlds Fair by a French engineer by the name of Eiffel in order to prove to the world that sky scrapers were indeed possible mathematically and engineering wise. Large American corporations seized on the idea, finding that it was much more efficient to house all of a corporation's secretaries, file cabinets, and various departments all under one big roof. But I have recently heard that the coming of the desktop computer and the internet has made sky scrapers essentially obsolete, because nowadays there is no real advantage to having everyone all together in one spot, or even in one country any more. The huge American retailer Sears Roebuck found this out and promptly sold the Sears tower in Chicago to some Japanese investors. As far as I know, the only new large mega skyscrapers that are seriously planned are in the Orient, where space is at an extreme premium. I think that in the not too distant future, the largest man made structures will be large Geodesic domes erected on the surfaces of the Moon and Mars, where it will be necessary to hold in the breathable atmosphere. I am looking forward to it. Someday we may even build the "space elevator" that will be a structure that will extend from the Earth's equator to 3 or 4 Earth diameters out into space. You just get on the elevator like any other elevator and just ride up into Earth orbit! Now that will be one heck of a tall building!