This museum is located in the highschool. It features findings of digs that took place in a medieval hermitage and in a late-roman necropolis, by the Guadiana river.
The ancient Citadel, as well as important sections of the wall that surrounded the population, are still preserved. Archaeological work carried out in the Citadel of the Castle uncovered a Moorish quarter of centuries XII\/XIII, and various Roman structures of the 4th century. The Arab ceramic pieces found are exposed in the core of the Museum of Mértola.
A Casa do Mineiro – Centro de Documentação, é o primeiro pólo permanente do Museu da Mina de São Domingos. A sua construção pretende ser um contributo para a reconstrução e dignificação da aldeia mineira, das suas gentes e da sua memória. Nessa perspectiva, associaram-se a este espaço dois equipamentos. O museográfico, com a (re) criação da Casa do Mineiro, e o espaço de recolha da memória, com a instalação dum Centro de Documentação.
A space located in the Convent of Saint Francis of Mértola. It exhibits irrigation systems used since the days of the Moors and the importance they had. As one visits the convent, it is also possible to visit the botanycal garden, the birds reservation and the art gallery.