In Mauritania, northwestern Africa, slavery is a fact of modern life. It's estimated that 10-20 percent of the country's 3.5 million people are still enslaved in a system rooted in ethnic discrimination.
The ancient ruins of Palmyra are remnants of a bygone golden era. For several days now, the ruins have been controlled by the militias of Islamic State. UNESCO has warned that the World Heritage site is now at risk of being destroyed.