It is located on Rua da Sra. da Graça, City of Lagos, Algarve, Southern Portugal
 
Based on the scientific knowledge produced about the arrival and presence of slaves in Lagos, and the understanding of the role played by the slave trade and the slavery of individuals with African ancestry, the museum program was created.

The project aimed to transmit ideas and concepts of local history and identity, creating communication and intensifying the relationship with the Museum's different audiences, whether residents or visitors, encouraging them to participate in the museum's activities and local development.

The exhibition at the Slave Market is spread over 2 floors and constitutes an additional attraction factor for the municipality of Lagos. It is a place to discover the new urban places that constituted in the 15th century with the arrival of the first sub-Saharan slaves.

The building has two chronologically distinct floors, the lower one from the 14th century built for the slave market, and the upper one from the 17th century intended for the Guard Corps, the main façade has two registers with a double arcade narthex closed by mannerist iron grilles, and two large rectangular and framed windows from the end of the 17th century are on top.

The architecture of the building is characterized by an austere and functional architectural language that is integrated into the context of rationalization of resources, equally evident in the Armazém Regimental and Oficina do Espingardeiro buildings, but which here presents a markedly erudite aspect in the careful projection of volumes.

The city's emblematic building is testimony to its connection to the Age of Discoveries. It was in this place that the first slave market in 14th century Europe hypothetically operated, with the first sale of slaves in the Algarve taking place here.

The main facade to the southeast, with two registers, divided at the bottom by two arches, closed by a cast iron grille, at the top are two rectangular windows with stonework frames.

The right side facade, torn by two arches, on the ground floor and four windows on the upper floor; stone coat of arms, of the Marquis of Nisa, the left side facade almost blind and only torn by a window on the 2nd floor. On the ground floor there are two differentiated spaces: one open and surrounded by four round arches in stonework, the other closed consisting of a single room, access to the 2nd floor via a staircase located in the building attached to the NW.

Inside, differentiated spaces, high ceilings, wooden flooring and double-leaf doors with flags.

The Slave Market – Slavery Museum Center inaugurated on June 6, 2016 and an integral part of the Dr. José Formosinho Municipal Museum proposes a historical journey that begins in the period of the Portuguese Discoveries (15th century) when the first black slaves arrived in Lagos, and to make us reflect on the new forms of slavery in the context of the Rota dos Escravos project launched by UNESCO in 1994.

The museum center evokes the past of the slave trade in Lagos at the time of the Discoveries and was created in collaboration with UNESCO's "Slave Route" project.

On Floor 0, visitors are welcomed and the points of interest on the Lagos na Rota da Escravatura itinerary are publicized, and Floor 1 hosts the long-term exhibition that addresses the theme of slavery in the city's history.