All around the world, arch monuments are among the most celebrated landmarks. These are beauty and perfection at their best, with great intricacy and symmetry, and mankind is proud of these architectural achievements. But, whatever man does, Nature has already done it - better and with greater finesse. That is why, when we lay our eyes upon the stunning natural arches in the world, the man-made ones look rather artificial, and even their perfection seems kind of ordinary. Here is a lis...