Dolmen de Sierra Gorda (Valle de la Serena) Monument · Valle de la Serena, La Serena, Badajoz Image of Valle de la Serena, not of the place itself. Megalithic monument located within the municipal boundary of Valle de la Serena; the municipality also preserves the Museo de la Casa Labriega (Farmhouse Museum), housed in a traditional 16th-century dwelling. Photo: Adolfobrigido (CC BY-SA 4.0) What to see and do in Valle de la Serena