The journey from Mexico City to Guerrero state in south-western Mexico is particularly stunning at this time of year.
For several hours, you cut through mountains that look greener than usual because of the rainy season.
But the beauty of these hillsides belies the pain in this region.
Guerrero's foothills are home to much of Mexico's illegal poppy and marijuana production, the source of a large part of the violence seen in the state today.
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