By 2007, the 25,000 residents of a Chilean mining town had moved out of their homes due to concerns about pollution levels from one of the largest copper mines in the world.

Today, the ghost town of Chuquicamata, located in the Atacama Desert, lies empty.

But once a year, the former residents return to celebrate the life they once had there with a weekend of partying, during which they sing happy birthday to the town.

Patricia Rojas revisits and reflects on her 25 years living in this now-deserted desert town with Robin Markwell.

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by the past. We take you to the events that have shaped our world through the eyes of the people who were there. For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more. Recent episodes explore everything from the death of Adolf Hitler, the first spacewalk and the making of the movie Jaws, to celebrity tortoise Lonesome George, the Kobe earthquake and the invention of superglue. We look at the lives of some of the most famous leaders, artists, scientists and personalities in history, including: Eva Peron – Argentina’s Evita; President Ronald Reagan and his famous ‘tear down this wall’ speech; Thomas Keneally on why he wrote Schindler’s List; and Jacques Derrida, France’s ‘rock star’ philosopher. You can learn all about fascinating and surprising stories, such as the civil rights swimming protest; the disastrous D-Day rehearsal; and the death of one of the world’s oldest languages.

(Photo: Chuquicamata. Credit: BBC)