The Hall of Prayer for Good Harvests is a round, pointed-roof hall built entirely of timber without main beams or iron nails, its columns arranged to match the seasons and hours, joining timber craft with cosmology. Completed in 1420 under the Ming, it was rebuilt to its original design after a fire in 1889.

Ming dynasty to present
1420 · OriginIn 1420 (Yongle 18), the Temple of Heaven was completed together with the Forbidden City, originally as an altar for joint sacrifice to Heaven and Earth.1889 · EvolutionIn 1889 (Guangxu 15) the Hall of Prayer for Good Harvests burned after a lightning strike and was then rebuilt in its original all-timber form.
Sources (1)
  1. Temple of Heaven (Wikipedia)

The Hall of Prayer for Good Harvests is a round hall of timber alone with a pointed roof, without main beams or iron nails. The layout of its columns matches the seasons and hours, and shows the joining of ancient timber craft with a view of the cosmos.

In the eighteenth year of Yongle of the Ming (1420) the Temple of Heaven was completed at the same time as the Forbidden City, at first as the Temple of Heaven and Earth, where heaven and earth were worshipped together.

In the fifteenth year of Guangxu of the Qing (1889) the hall was destroyed by lightning fire, and was then rebuilt to its original form, again entirely of timber.

The Hall of Prayer for Good Harvests is the class in the chapter on Architecture on the Hall of Prayer for Good Harvests at the Temple of Heaven in Beijing. The hall is a round building of timber alone with a pointed roof, without main beams or iron nails, and its columns are laid out to match the seasons and hours, joining timber craft with a view of heaven and earth.