Just becasue you cannot prove something because of your modern science inability, doesnot mean it doesnot exist or it didnot happen. Until you prove that it is NO, its a 50% - 50% chance. So, its better you keep it as is and donot touch the bridge. Also, the simple thing like there is no other place in the world where you see this big bridge (it may be natural in your view) and hence DONOT DESTROY IT.
