Constructed around the 3rd century BCE (approximately 2,200 years ago) during the reign of the Mauryan Emperor Ashoka the Great, the Kesariya Stupa was one of the tallest stupas built in India and possibly the tallest in the world at the time. When it was discovered, the Kesariya Stupa's height was about 130 feet, but after the 1930 earthquake and continuous natural disasters, its present-day height is around 103 feet. According to the accounts of Faxian and Xuanzang, the height of the Kesariya Stupa was estimated to be between 200 and 300 feet, which could be somewhat plausible since no one knows how many earthquakes and catastrophes this ancient marvel has endured while still standing tall after 2,200 years.
Also the main feature of this marvel was headless buddha statue between each step and gaps, showing ancient Indian architecture and designs which they use to decorate the stupa,
Kesariya Stupa exhibits numerous architectural parallels with the Buddhist temple of Borobudur in Indonesia, like mandapa Both monuments share a circular mandala form with terraces containing figures of Buddha in the niches. Like Borobodur, Kesariya is also built atop of a hill. The excavated chambers at Kesariya show a combination of statues in bhumisparsha and dhyanimudra on the same side, whereas Borobudur houses four Jina Buddhas, displaying their respective mudras on the four sides of the monuments, also In addition, a large stone slab that is black in colour was also discovered at Kesaria. This contained a script from the 10th-12th known as Siddhamātṛkā that was used in Java, Both sites use a combination of square and circular terraces, although Kesaria is dominated by more circular forms. Both sites do not have their tops visible from the ground level, follow numerological patterns, and have roughly the same dimensions as well. Showing they have one basic foundation plan to create both, During pala empire rule over bihar the design of Kesariya stupa it reach sri vijaya where they created Borobodur temple,(we should celebrate that indonesian brother refine the design of Kesariya stupa to really creating a New grand architecture called borobudur temple which was now UNESCO world heritage site, pakistan and Bangladesh need to learn from our Indonesia brother who not only cherish there ancestors culture and refine it but also protect it.)
I hope Indian government do necessary restoration on it(like indonesia govt do on Borobodur Temple in Indonesia), as it was one of pride of ancient India which need to be protected, or it will again get damaged more, this stupa name and its glory should be in UNESCO world heritage site list like Borobudur temple was,but sadly it was still in ruins, many people in india don't even know about, which was very sad, it was one of four great Maurya empire surviving marvel followed by the great Sanchi stupa, Mahabodhi temple, barbar caves.
Kesariya stupa built around 2200 yrs ago( faxian and xuanzhang all wrote about it and it's grandness)
Borobodur temple build around 750 ce around 1275 yrs ago during reign of Shailendra dynasty
Detail design of kesaria stupa at first and then second design was of Borobudur temple showing similarities between those two