The Jetavanaramaya stupa in Anuradhapura, Sri Lanka, stands as one of history's most remarkable engineering achievements. Completed around 301 CE, this massive religious structure originally reached 122 meters (400 feet) in height, ranking as the third-largest man-made building on Earth at the time, surpassed only by the Great Pyramids of Giza.

Built using an estimated 93.3 million baked mud bricks, the stupa formed the centerpiece of the vast Jetavana Vihara monastic complex. The structure housed hundreds of monks and served as a focal point for Buddhist devotion and cosmological order. Despite centuries of collapse and restoration, Jetavanaramaya remains the largest brick structure by volume ever constructed, standing at roughly 71 meters (233 feet) today.

Ancient Sri Lankan engineers demonstrated sophisticated understanding of structural design through the stupa's massive hemispherical form, which efficiently distributes weight. The construction required extraordinary organization, with archaeologists identifying ancient brick kilns throughout Anuradhapura. While no records specifically mention animals at Jetavanaramaya, historians believe elephants and bullock carts were used for material transport, as at other major Sri Lankan construction sites.

Quick Fact: Jetavanaramaya was completed around 301 CE using an estimated 93.3 million baked mud bricks.