The walled city of Mertola is guarded by a stone fortress and overlooks the River Guadiana in the Alentejo, Portugal.

Walled medieval city of Mertola is guarded by a stone fortress and overlooks the River Guadiana in the Alentejo, Portugal.

The walled city of Mertola is guarded by a stone fortress and overlooks the River Guadiana in the Alentejo, Portugal.

The walled city of Mertola is guarded by a stone fortress and overlooks the River Guadiana in the Alentejo, Portugal.

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