Sprawled across the border of what are now Peru and Bolivia, Lake Titicaca is seven times the size of Los Angeles. Despite the lake’s massive proportions, itsy-bitsy Incan artifacts have been turning up there for the last 50 years. Recently, a small box with remarkable Incan offerings was found at the base of a reef, the first-ever such discovery on the Bolivian side of the water. Inca people were already dropping offerings below the surface of Titicaca when the Spanish began looting South America in the 16th century. According to…