Sun Yat-sen Memorial Hall, located at the southern slope of Yuexiu Hill, was constructed between 1929 and 1931, a monument to commemorate Dr. Sun Yat-sen, the great forerunner of Chinese revolution, by the people of Guangzhou and overseas Chinese. Dr. Sun Yat-sen's Memorial Hall, an octagonal building with grand presence, features a strong Chinese style. The Hall saw its construction started in 1929 and completed in 1931 at where the Presidential Palace had been. The 52m-high main hall accounts for 12000m2 out of the total 6.3 hectares of the whole complex. It spans as wide as 71 meters in the absence of a single pillar, thanks to the designer's ingenious application of the architectural mechanics and structural combination of steel framework and ferroconcrete. The main hall holds a 15m-wide, 20m-deep stage and 3238 seats. In the hall there is also a display gallery showing pictures and letters of Sun Yat-sen. The oldest ceiba in Guangzhou City grows in the hall, you can also have a chance to see the two biggest white jade orchid trees of Guangzhou.