original_query: What caused damage to the World Heritage area in 2012 and 2013?
query: What caused damage to the Nazca Lines World Heritage area in 2012 and 2013?
answer: In 2012, squatters occupied land in the area, damaging a Nazca-era cemetery and allowing their pigs to access some of the land. In 2013, machinery used in a limestone quarry destroyed a small section of a line and damaged another.