Not so long ago, similar ones were also discovered in Bosnia.

If the stone balls had been left at the original place, would they form a gigantic prehistoric planetarium? If there are still ancient sites aligned with stone spheres in their original position, it is believed to be related to the equinoxes and solstices.

In fact, American archaeologist Samuel K Lothrop, has a theory that the stones were placed in 'astronomically-significant' alignments.

The enigmatic Costa Rica stone spheres, created by the Boruca Indians between 400 and 1,500 in the south of the country, are part of a rich Costa Rican legacy, according to Costa Rican sculptor, Jorge Jimenez Deredia.

The spheres are “a symbolic representation of a political and spiritual power” that is a legacy “very specific to Costa Rica”, whose memory was “erased” during the Spanish colonization, Deredia said.

“The sphere is a concept of integrity, and horizontal integration of society. Such are the characteristics our ancestors, but the Costa Ricans do not know where they come from,” Deredia explained.

At the same time, searching for clues to their origin and dating is difficult.
No one knows exactly how old the balls are, because Costa Rica had no recorded history before the arrival of Columbus in 1502.

Researchers have tried to obtain information on the spheres from the local inhabitants. However, the spheres were previously unknown to them and they could offer no relevant clues regarding the artifacts.

They have perfection in roundness of 95% and ranging from 10 inches in diameter up to 2.57 meters, with a maximum weight of 15 tons.

The stone spheres in Costa Rica were discovered in 1939 in an old 10-hectare banana farm called Finca 6 in the town of Palmar Sur, Puntarenas province (South Pacific).
Many of these sculptures were removed from their original sites and even damaged or destroyed by the myth that treasures were hidden inside.

Still, one of the most important questions is: Who did inspire the work of the Boruca Indians?

Unless, of course, they were skilled and advanced technologically, mathematicians and stonemasons.

In 1945, an American antropologist and archaeologist, Matthew Williams Stirling, who spent most of his career at the Smithsonian Institution, discovered a large number of stone spheres in Mexico. They were almost perfectly spherical.

Stirling believed that the spheres were formed by high temperature nucleation of glassy material around glass shards within an ashfall tuff, as a result of tertiary volcanism.

Can nature produce so many such perfectly round-shaped spheres?

John Hoopes, University of Kansas associate professor of anthropology and director of the Global Indigenous Nations Studies Program, recently returned from a trip to Costa Rica where he and colleagues evaluated ancient stone spheres for UNESCO, the United Nations cultural organization that might grant the spheres World Heritage Status. Credit: John Hoopes

"We really don't know why they were made," Hoopes said. "The people who made them didn't leave any written records. We're left to archeological data to try to reconstruct the context. The culture of the people who made them became extinct shortly after the Spanish conquest.

So, there are no myths or legends or other stories that are told by the indigenous people of Costa Rica about why they made these spheres."

"We think the main technique that was used was pecking and grinding and hammering with stones," said Hoopes. "There are some spheres that have been found that still have the marks of the blows on them from hammer stones. We think that that's how they were formed, by hammering on big rocks and sculpting them into a spherical shape."

Although many theories have been put forward, nobody really knows when or how these ancient stone spheres were made, by whom, or for what purpose.

Unknown stonemasons in the distant past were interested to place these mysterious stone artifacts in some places of our globe.

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