Towering above […] is the immense, bubble-shaped dome of Jetavanaramaya—a structure so large that when it was completed in the early fourth century CE, it ranked as the third-largest man made building on Earth, surpassed only by the Great Pyramids of Giza. Completed around 301 CE using an estimated 93.3 million baked mud bricks, the stupa originally rose to around 122 meters (400 feet), making it one of the tallest structures of the ancient world. Jetavanaramaya refers not on