Japan's Imperial Household Agency says nearly 20,000 people visited the Daijokyu complex in Tokyo when it opened for public viewing on Thursday. It was built for Emperor Naruhito to perform a key thanksgiving ritual marking his enthronement.
About 1,400 people were already waiting when the Sakashita-mon Gate of the Imperial Palace was opened to visitors at 9 a.m.
The Daijokyu complex is comprised of more than 30 structures in a roughly 90-by-90-meter area in the East Gardens of the Palace.
The Emperor performed the Daijokyu-no-gi ritual on November 14 and 15 in the complex. He offered newly-harvested rice to the deities and prayed for peace and a bountiful harvest.
The complex cost about one billion yen, or 9 million dollars, to build. But it is set to be demolished over a three-month period from mid-December.
The building with guest seating for the ritual and other structures have been removed to create space for visitors to walk around.
The Daijokyu complex will be open to the public until December 8th.