A sign of a restaurant and bar is seen on the wall of the old English fort in the historic slave town of 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 descendants of slaves from America, the Caribbean and Europe visit ancient sites to delve into a dark and often hidden past. Picture taken July 17, 2019. REUTERS/Afolabi Sotunde