Estadio Azteca Upper Deck (Mexico City)

The Upper Deck at Estadio Azteca is a safety nightmare, with vertiginous concrete steps and missing handrails that have caused fan injuries for decades. Its 30% steeper incline than the average stadium upper tier makes it 50% more dangerous than #3 Tropicana Field's cluttered catwalks, which at least have clear signage. Despite the legendary lower bowl, this upper section's flawed design sparks continuous safety debates, proving grandeur doesn't excuse lethal architecture.