Costa Rica’s Diquís Delta stone spheres are one of Central America’s most intriguing archaeological phenomena. Since the 1930s, hundreds of stone balls have been documented, ranging in size from a few centimeters to over six and a half feet (two meters) in diameter. No half-finished stones have ever been found. And there are over 300 of them. Over 300 round stone spheres, made by human hands, with no discernible purpose or ritual significance.
Put all together, the Diquis Delta stones are extremely mysterious.