Late Megalithic Tombs Found at Cape Trafalgar, Spain

By 1800 BCE, most people in Iberia had stopped burying their dead in big shared stone tombs. Yet on a sandy cape in southern Spain, a community appears to have kept doing exactly that. New radiocarbon dates from Cape Trafalgar show that two megalithic tombs were in use between 1875 and 1625 BCE, and the evidence hints that people may have built them only shortly before they filled them. If that holds up, Trafalgar could be one of the last places in the region where anyone raised a monument of this kind.

A Cape Better Known for a Sea Battle

Cape Trafalgar sits near Barbate in Cádiz province, close to the Strait of Gibraltar. Most people know it for the 1805 naval battle, but its sandy tombolo, a strip of land that joins a small headland to the mainland, also hides a prehistoric burial ground. Researchers from the University of Cádiz, led by Eduardo Vijande-Vila, excavated there in 2021 and 2022 and uncovered two megalithic tombs. Each one held several people buried together. A local report from June 2022 described the second tomb as a tholos-style chamber, with a short corridor of upright slabs leading to a circular room made of large stones, and said it held at least five individuals in an ossuary plus another in the corridor.

What the Radiocarbon Dates Show

In the new study, published on 11 November 2026 in PLOS One, the team radiocarbon-dated 16 individuals from the two tombs and ran the results through Bayesian statistical models. Those models place both tombs in use between 1875 and 1625 BCE, during the first quarter of the 2nd millennium BCE. The burials also came with grave goods made of gold, silver and ivory.

Why a Bronze Age Megalith Is Unusual

Across Iberia during the Bronze Age, burial customs moved away from large collective tombs and toward smaller, individual graves. That shift happened unevenly, and some regions held on to the older tradition for longer. Southern Spain is one of the latest areas known to keep using collective burials. But most of the evidence from this period shows people reusing monuments that Copper Age communities had built centuries earlier. Trafalgar looks different, because the team found no older material in the tombs and no earlier occupation in the surrounding area.

That leads the authors to suggest the necropolis may have gone up only a short time before people began using it. They are careful to say that more dating is needed to confirm this. The title of their paper even ends with a question mark, asking whether these were the last builders of megaliths in the south of the Iberian peninsula. For now, the safest reading is that Trafalgar may be one of the latest megalithic construction projects in the region.

Digital Models and a Race Against the Sand

The team recorded both tombs with a 3D scanner and photogrammetry, which lets them study the architecture in detail and share the models with the public. That work matters because the site is fragile. Strong winds and shifting sands could bury the tombs again, and the researchers say the area may hold more undiscovered tombs. Keeping the site visible will need ongoing maintenance.

What Happens Next

The authors call for further dating to pin down exactly when the tombs went up, and for more survey work to find any other tombs in the necropolis. A tighter timeline would show whether Trafalgar truly marks the end of the megalithic tradition in southern Iberia, or whether other communities kept building as well.

Sources

• Vijande-Vila E. et al. (2026). “The last builders of megaliths in the South of the Iberian peninsula? The Bronze Age necropolis of Trafalgar (Barbate, Cádiz, Spain).” PLOS One 21(11): e0359220. doi.org/10.1371/journal.pone.0359220
• Archaeology News Online Magazine: Megalithic tombs stayed in use late into the Bronze Age in southern Spain
• Diario Bahía de Cádiz (June 2022): report on the second tomb at the Trafalgar tombolo (Spanish)

Image: aerial view of Tomb II at Cape Trafalgar. Credit: E. Vijande-Vila et al., PLOS One (2026).