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Built in 1420, then rebuilt in 1889, this circular tower, with a conical roof of blue tiles and a gold finial, is the most beautiful building in Beijing. One of the most striking facts about it is that it was constructed without the use of a single nail.

The circular ceiling of the Hall of Prayer for Good Harvests has a gilded dragon and phoenix at its center. The wood for the four central columns was imported from Oregon, as at the time China had no trees tall enough.

The Hall of Prayer for Good Harvests sits atop three tiers of marble that form a circle 300 ft (90 m) in diameter and 20 ft (6 m) high. The balusters on the upper tier are decorated with intricate dragon carvings that serve to signify the imperial nature of the structure.

A raised walkway of marble and stone that runs exactly along the north-south axis of the temple complex, the Red Step Bridge connects the Hall of Prayer for Good Harvests with the Round Altar.

A circular hall made of wood and capped by a conical roof, the Imperial Vault once held the wooden spirit tablets that were used in the ceremonies that took place on the nearby Round Altar.

The Imperial Vault is enclosed by the circular Echo Wall, which has the same sonic effects found in some European cathedrals, where even a whisper travels round to a listener on the other side.

There are three rectangular stones at the foot of the staircase leading up to the Imperial Vault: stand on the first and clap to hear one echo; stand on the second stone and clap once for two echoes; clap once on the third for three echoes.

The altar is formed of marble slabs laid in nine concentric circles with each circle containing a multiple of nine pieces. The center of the altar represents the center of the world and it is where the emperor carried out sacrifices.

A red-walled, compound surrounded by a moat spanned by decorative bridges, the Hall of Abstinence resembles a mini Forbidden City. This is where the emperor would spend the last 24 hours of his three-day fast prior to partaking in the Temple of Heaven ceremonies.

Today, locals, inured both to the splendor of the buildings and to the crowds of tourists, use the extensive grounds to practice tai ji quan, and other martial arts, and to exercise.