In the 1930s and 1940s, laborers in southern Costa Rica, while digging drainage channels in banana plantations, stumbled upon mysterious stone spheres in the Diquís Delta. These spheres, some highly polished and measuring up to 2.57 meters in diameter, were not random artifacts but part of a larger settlement network indicative of a chiefdom. UNESCO notes that this discovery revealed an extensive archaeological landscape, including paved areas, mounds, and burial sites that had been hidden under layers of soil and vegetation for centuries. Despite their mathematical precision, the exact purpose and cultural significance of the spheres remain elusive to scientists, adding an element of intrigue to the find. However, the revelation of these spheres also led to the unfortunate plundering and destruction of many associated archaeological sites, complicating the historical narrative. While the spheres are a testament to the craftsmanship of the Diquís culture, they also highlight the impact of agricultural development on ancient landscapes.