Ruins of the late-Roman River Tower (Rio Torre) by the River Guadiana at Mertola in Portugal. It once guarded access to the port.

Ruins of the late-Roman River Tower (Rio Torre) by the River Guadiana at Mertola in Portugal. It once guarded access to the port.

Ruins of the late-Roman River Tower (Rio Torre) by the River Guadiana at Mertola in Portugal. It once guarded access to the port.

Ruins of the late-Roman River Tower (Rio Torre) by the River Guadiana at Mertola in Portugal. It once guarded access to the port.

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