23. Nevado del Ruiz volcano eruption
The eruption of Nevado del Ruiz or La Mesa de Herveo, as it is also called, happened in 1985. It is considered as the 2nd largest volcano disaster of the XX century. As a result of the eruption, the town of Armero in Tolima has disappeared completely. It is not surprising that this event was called the “Armero tragedy” – 25,000 people have died.