Library hidden in a cave... a unique repository of ancient manuscripts known as The Library Cave. A hidden cache of 50,000 books and rolls dating from c. 500 to 1002 that were deemed heretical and hidden in the cave in the early 11th century.
Giant Stone Balls - Workmen hacking their way through the dense jungle of Costa Rica to clear an area for banana plantations in the 1930s stumbled upon some incredible objects: dozens of stone balls, many of which were perfectly spherical. They varied in size from as small as a tennis ball to an astonishing 8 feet in diameter and weighing 16 tons! Clearly man-made, it is unknown who made them, for what purpose and, most puzzling, how they achieved such spherical precision.