Built in 1055, the Nagatoko is the Shingu Kumano Shrine's worship hall, and it is designated a national important cultural asset. Built as the main structure during the Heian period, its thatched roof is supported by 44 massive pillars, 45 cm in diameter. This comprises a single large, open stage with no walls, and is said to have been used for ascetic training by priests. At present, in the treasure house, visitors can view a copper pot and other national and prefectural designated cultural assets. Come autumn, the stand of 800-year-old ginkgo trees is bathed in yellow, making a beautiful contrast with the Nagatoko.