Back in 1963 in Friuli Venezia Giulia, Italy, 2,000 people lost their lives in a deadly situation at the Vajont Dam. After the government had previously dismissed reports that part of the basin wasn't stable, a megatsunami was caused by a landslide in the lake, sending a wave of about 13 billion gallons of water over the top of the dam. To date, it's the fifth deadliest structural failure in recorded history, and one of only five that have resulted in at least 2,000 deaths. From the research team at Forney Vault is this new infographic that looks at the 30 deadliest structural failures of all-time, with the highest death toll coming in 27 C.E. at the Fidenae Amphitheatre in Rome, Italy. It was then that 50,000 people attended the gladiator games, but the Fidenae Amphitheatre collapsed due to the capacity, as it had been cheaply constructed with wood. Not only is it the deadliest structural failure ever, but it resulted in so many deaths, that the death tolls is five times the amount of the second-ranked instance on this infographic.