One of the strangest mysteries in archaeology was discovered in the Diquis Delta of Costa Rica. Since the 1930s, hundreds of
stone balls have been documented, ranging in size from a few centimetres to over two meters in diameter. Some weigh 16 tons. Almost all of them are made of granodiorite, a hard, igneous stone. These
objects are monolithic sculptures made by human
hands. The spheres number over 300. The large ones weigh many tons. Today, they decorate official buildings such as the Asamblea Legislativa, hospitals and schools. You can find them in museums. You can also find them as ubiquitous status symbols adorning the homes and gardens of the rich and powerful.
The stones may have come from the bed of the Térraba River , to where they were transported by
natural processes from sources of parent material in the Talamanca mountains. Unfinished spheres were never found. Like the monoliths of the Old World, the Costa Rican quarry was more than 50 miles away from the final resting place of these mysteries.
Although some of these authors are often represented as having "discovered" these objects, the
fact is that they have been known to scientists since they first came to light during agricultural activities by the United Fruit Company in 1940.
Archaeological investigation of the stone balls began shortly thereafter, with the first scholarly publication about them appearing in 1943. They are hardly a new discovery, nor are they especially mysterious. In fact, archaeological excavations undertaken at sites with stone balls in the 1950s found them to be associated with pottery and other materials typical of the Pre-Columbian cultures of southern Costa Rica. Whatever "mystery" exists has more to do with loss of information due to the destruction of the balls and their archaeological contexts than lost continents, ancient astronauts, or transoceanic voyages.
Hundreds of stone balls have been documented in Costa Rica, ranging in size from a few centimeters to over two meters in diameter. Almost all of them are made of granodiorite, a hard, igneous stone. These objects are not natural in origin, unlike the stone balls in Jalisco, Mexico that were described in a 1965 National Geographic article. Rather, they are monolithic sculptures made by human hands.
The balls have been endangered since the moment of their discovery. Many have been destroyed, dynamited by treasure hunters or cracked and broken by agricultural activities. At the time of a major study undertaken in the 1950s, fifty balls were recorded as being in situ. Today, only a handful are known to be in their original locations.
Balls in the Courtyard of National Museum, San José, Costa Rica.
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