Borobudur

Borobudur stands as the world's largest Buddhist temple, a ninth-century mandala built from 2,672 relief panels and 504 Buddha statues rising from the Javanese plains. Its three-tiered pyramid spans 15,129 square meters, making it 40% larger than Prambanan (#2). Over 2 million volcanic stone blocks were assembled without mortar, a feat that has endured longer than many later structures, and its relief panels extend more than 6 kilometers in length, providing an unparalleled narrative of Buddhist cosmology.