Historic hilltop walled medieval village of Mertola with castle and fortified walls, Baixo Alentejo, Portugal, Europe

Historic hilltop walled medieval village of Mertola with castle, on the banks of the river Rio Guadiana, Baixo Alentejo, Portugal, Europe

Historic hilltop walled medieval village of Mertola with castle, on the banks of the river Rio Guadiana, Baixo Alentejo, Portugal, Europe

The 13th century castle and walled city, with a strong Islamic history, overlooking the Guadiana River, Mertola, Alentejo, Portugal, Europe

View over Mertola Castle and St. Mary's Church, Mertola, Alentejo, Portugal, Europe

View over Mertola Castle and St. Mary's Church, Mertola, Alentejo, Portugal, Europe

View on the city fortification, MÈrtola, Alentejo, Portugal

Mertola on the banks of Rio Guadiana in the Alentejo. Europe, Southern Europe, Portugal, March

Mertola on the banks of Rio Guadiana in the Alentejo. Europe, Southern Europe, Portugal, March

Mertola on the banks of Rio Guadiana in the Alentejo. Europe, Southern Europe, Portugal, March

Mertola on the banks of Rio Guadiana in the Alentejo. Europe, Southern Europe, Portugal, March

Mertola on the banks of Rio Guadiana in the Alentejo. Europe, Southern Europe, Portugal, March