Armero was once a prosperous place. Now it is an open-air graveyard and a place of bitter memories. The village in central Colombia was literally wiped out in one of the deadliest volcano eruptions in modern history. Fernando Salinas gave us a tour of what is left of Armero and spoke of that fateful day, November 13, 1985. He told us: "I lived in this house with my wife and our three daughters. That night I was on the outskirts of the village. When I realised what was happening, I ran here. The electricity was down. People were running everywhere. We got lost. I arrived alone at the shelter. I lost my wife and two daughters." The eruption of the Nevado del Ruiz volcano caused a giant mudslide that flooded the village, killing around 23,000 people.