Ha’amonga 'a Maui, located in Tongatapu, is Tonga's most iconic historical landmark and a marvel of ancient Polynesian engineering. Dating back to around 1200 AD, this stone trilithon, constructed under the rule of Tu’i Tonga Tu’itatui, consists of three massive coral limestone slabs weighing about 30 to 40 tons each. Often likened to the Stonehenge of the Pacific, Ha’amonga 'a Maui is a testament to the architectural ingenuity of ancient Tongans. Interpretation panels at the Niutoua site offer insights into the historical theories behind its construction.