Temple of Heaven.

The Temple of Heaven is a Taoist temple in Beijing, the capital of China. The temple was constructed in 14th century by Emperor Yongle of the Ming Dynasty (who also built the Forbidden City) as his personal temple, where he would pray for good harvest and to atone for the sins of his people.

Close up of the Hall of Prayer for Good Harvest, Temple of Heaven 

The Temple’s architecture is quite interesting: everything in the temple, which represents Heaven, is circular whereas the ground levels, which represent the Earth, are square.

Ceiling of the Imperial Vault, Temple of Heaven.