People steer canoes on a lagoon by the bridge near the historic slave port town Ouidah, Benin July 17, 2019. The 400-year anniversary of the first slave boat to arrive in America from Africa has caused a rush of interest in heritage tourism in West Africa, as ancestors go back to ancient sites to delve into a dark and often hidden past. Picture taken July 17, 2019. REUTERS/Afolabi Sotunde