Mértola is a small historic town in the Alentejo region of Portugal, located on the banks of the Guadiana River. It has a rich and diverse history that dates back to prehistoric times, making it an important archaeological site.

Throughout its history, Mértola has been ruled by the Phoenicians, Romans, Visigoths, and Moors, before eventually being reconquered by the Portuguese in the 13th century. Today, the town is a fascinating blend of architectural styles and influences, with medieval walls, narrow streets, and traditional whitewashed houses mixed with remnants of its Islamic past, including the impressive 13th-century castle and mosque.

One of the highlights of a visit to Mértola is the Museu de Mértola, a museum located in a 16th-century Islamic house that showcases the town's rich history and archaeological treasures. Visitors can explore the museum's collections of ceramics, jewelry, and other artifacts, as well as learn about the town's Islamic past and its role in the history of Portugal.

Mértola is also a popular destination for outdoor enthusiasts, with the Guadiana River offering opportunities for fishing, boating, and swimming. The surrounding countryside is home to a number of hiking and biking trails, and there are several nature reserves in the area where visitors can spot rare birds and other wildlife.