In this June, 27, 2018 photo, tourists walk through a tunnel at the medieval-area Castle of Lagos in Lagos, Portugal. Lagos, a striking Portuguese beach town of charming coastlines and slightly sandstone cliffs, is the birthplace of the African slave trade in Europe. A museum dedicated to slavery is helping this enclave in the heart of southern Portugal's Algarve region come to terms with its history. (AP Photo/Russell Contreras)
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