Ancient secrets: The ‘mysterious’ stone spheres of Costa Rica

Scattered across the lush landscapes of Costa Rica’s Diquís Delta lie nearly perfect stone spheres, some as small as a tennis ball and others weighing several tons. They are locally known as Las Bolas. These enigmatic relics have fascinated archaeologists, historians, and curious travellers alike since their discovery in the 1930s. For the longest time, some even spoke of them as something unearthly.

So, what are the stone spheres?

The stone spheres are crafted from various materials, primarily granodiorite—a hard volcanic rock—and limestone. With diameters ranging from a few centimeters to over 2 metres, some weigh as much as 15 tons. Many of these artifacts are so precisely rounded that they defy belief, considering they were likely created over a thousand years ago. These spheres were first discovered in 1939, during banana plantation excavations by the United Fruit Company.


So, are they made by humans? Most definitely. Studies attribute the spheres to the indigenous Diquís people. This civilization was known for its advanced craftsmanship and social organization. Though they left no written records, making the spheres was one of their most enduring legacies. Archaeological evidence suggests the spheres were carved using rudimentary tools.

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While their craftsmanship is undoubtedly impressive, calling the spheres “mysterious” might not be entirely accurate. Archaeological studies suggest they were likely used as status symbols, territorial markers, or as part of ceremonial practices.


Many of these spheres were removed from their original sites, because of which, it was a challenge for researchers to study them. In the absence of proper studies, some local legends claim that these spheres were crafted by extraterrestrials. Some even say they have mystical powers!


Today, the stone spheres are recognised as a UNESCO World Heritage Site, part of the “Pre-Columbian Chiefdom Settlements with Stone Spheres of the Diquís.” Visitors can view these artifacts at various locations, including the National Museum in San José and the sites where they were discovered.

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It is for sure that the stone spheres of Costa Rica are not made by aliens. What remains truly mysterious, however, is the cultural and spiritual significance they held for the Diquís people—a story that has been lost to time. One can't help but wonder— these spheres, what were they even used for?