16. The Sanchi Stupa or the Great Stupa of Sanchi 桑奇大塔建于孔雀王朝阿育王...

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The Great Stupa at Sanchi is one of the most important Buddhist monuments reflecting gem of Buddhist art and architecture. Located at Sanchi Town, Madhya Pradesh, India, this Stupa is the oldest stone structure in India that was built during the Mauryan period. Originally commissioned in the third century BCE by Emperor Ashok this huge hemispherical dome with a height of 12.2816.46 m (54.0 ft) consists of a central chamber where the relics of Lord Buddha are placed. Four ornamental gateways facing four directions and a balustrade surrounding the Stupa were later added in the first century BCE. A typical example of a Stupa and an excellent illustration of the development of Buddhist art and sculpture starting from the third century BC through the twelfth century AD, the Sanchi Stupa attracts hundreds of visitors from across the world. Enlisted as a UNESCO World Heritage Site since 1989, it is counted among the best conserved ancient Stupas of central India.

https://www.culturalindia.net/monuments/sanchi-stupa.html

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In the war of Asoka attacking Kalinga, 100000 people died and about 150000 people were displaced. From this, he saw the devastation of the war on people. He began to regret his cruel expedition, so he gave up the war, studied tolerance, kindness and other Buddhist ideas, and spread Buddhism through decrees, laws, and inscriptions on stone columns.
He believed that Buddhists would leave relics after their death, so he built a stupa in China as a place to store relics and teach Buddhist ideas. He built thousands of stupas in China, and Sanqi Tower is one of the famous stupas, which is of great significance to the spread and development of Buddhism.