Since the potential for mistake from architectural blue print to completion of construction is infinite and the margin for error is infinitesimal, man-made structures inevitably fail from time to time. Bad design, faulty construction and unanticipated loads, often in combination with one another, are frequently the culprits of catastrophic collapse. Both breathtaking and terrifying, bridges, tunnels, dams and buildings can crumble in mere seconds. Our gallery contains the most astounding instances of architectural failure, from 27 A.D. to modern times and from rural China to the good old U.S. of A — click at your own risk.

The 50 Worst Architectural Fails.