Introduction to Ashoka Pillars: Ashoka Pillars are stone pillars erected throughout the country to promote Buddhism after King Asoka (304 BC - 232 BC) of the Mauryan Dynasty in ancient India converted to Buddhism. On them are engraved Buddhist scriptures are for common people to study. This column is made of granite stone and is 13 meters high. It is empty inside and has the Buddhist classic "Prajnaparamita Heart Sutra" engraved on its surface. This sutra condenses the essence of the entire Boruo classic. The full text is 260 words, concise and concise, and is widely recited. The four lions guard the four directions and the stone pillars, which also represent the majesty of the unified Mauryan Empire.