There are places or monuments which are neither natural sights nor human works of art. The mystery becomes a feature of these places. This is about Tonga Gate, located in the Tonga kingdom.

In the middle of dense tropical forests, in the north of the Tongatapu Island, close to the village of Niutoua there is a clearing with a strange arch. The construction looks like the "P" letter. This is “Haamonga-a-Maui” or “Tonga Gate”.

The unusual construction looks exactly like a gate made of very porous stone. It was made of three limestone coral slabs. On the stone, you can even see the parts of corals. It is a very interesting and large building. The length of each slab is about six meters, the approximate weight of each one is about 20 tons.
The first thing catching your eye is the dissimilarity of the slabs. The upper crossbar is a little narrower, like someone or something left a special deepening for a joining, and there should be another part.

Limestone is rather porous and ancient, but solid. If you wish, you can examine the arch from above. Just climb to it and see if scientists have missed something.
Nobody can say for sure how the Tonga Gate was installed. But we know the approximate date of construction - the beginning of the 13th century. The Tonga Kingdom did not have written language, all the stories passed from mouth to mouth, including the story of the arch’s installation. Some facts were known only in the 20th century from the historiographer of the royal family.

There is a version that the arch was functioning as a gate. It was the entrance to the territory of the ancient capital of the Tonga Kingdom. Going through the arch, you become a respected guest of the Kingdom and can approach the royal throne. Now, it is a stone with small recesses located in the place where the throne was supposed to be. Locals are sure that these are the prints of the back and shoulders of ancient rulers.