That’s a scary-looking dam, isn’t it? It’s the Vajont Dam in the Italian Alps and one of the tallest in the world.
In 1963, a massive landslide in the reservoir upstream caused a megatsunami 820 feet (250 meters) tall. 50 million cubic meters of water was displaced, over half the volume of the reservoir. Think about it, each cubic meter of water weighs 2,200 pounds (around 1,000 kg).
The waves easily overflowed the dam and crushed Longarone, a town at the base of the dam. There were 1,300 fatalities in the town, a 94% mortality rate. The dam itself survived.
Today, the Vajont Dam still stands but is no longer used. Longarone has rebuilt and again has a healthy population.