Valongo Wharf (Cais do Valongo), July 27, the 8th Valongo Wharf Wash. The event celebrated the two years of the Valongo Wharf's title as a World Heritage Site by UNESCO. The pier was the main port of entry for African slaves in Brazil. It is estimated that over one million enslaved blacks have passed through in 300 years. The Washing of Valongo's Wharf is an act of respect for the millions of human beings forcibly brought from the African continent to unknown lands.