The Tokyo Imperial Palace is the main official residence of the Emperor of Japan.

The building is located inside a small park located in the central district of Chiyoda, near Tokyo station.

It is a large park-like area located in the Chiyoda ward of Tokyo and contains buildings including the main palace, the private residences of the Imperial Family, an archive, museums, and administrative offices.

It was built upon the remains of the old and renowned Edo Castle, one of the most important centers of ancient medieval Japan.

The remains of the older structures of the Edo Castle were used as foundations for the newer buildings, and are made of megalithic blocks placed together in a polygonal style similar to the one that can also be observed in the Mediterranean Area and South America.

The Edo Castle was built in 1457 AD, and rarely this kind of masonry work belonging to that era can be found throughout Japan.

We can easily speculate that the medieval people of Japan were capable of building megalithic structures. However, the Japanese medieval people documented and recorded their buildings as well as the constructive processes, but we find no mentions about the megalithic architecture anywhere.

The megalithic blocks that surround the castle were put into place without mortar, they are as large as a person and perfectly squared.