The Memorial Site of the 4th National Congress of the Communist Party of China in Shanghai was reopened to the public on Monday following six months of upgrading.

Located in Hongkou district, the memorial site now measures 3,040 square meters, up from the previous 1,839 sqm.

"The upgraded memorial hall will further explore, protect, and publicize its abundant Party history resources, and provide vivid education materials and propaganda services for the history learning and education activities of the Party across the city and the country," said Guo Fang, secretary of the Hongkou District Committee.

The 4th National Congress of the Communist Party of China was held from Jan 11 to 22 in 1925 in a room located at today's 254 Dongbaoxing Road. The original site of the congress was a shikumen residential building, which was destroyed during the war in 1932 and rebuilt in 2006.

According to Tong Ke, the curator of the memorial hall, the upgraded memorial hall reproduces the vivid scene of the 4th National Congress in 1925 through multimedia interactive technology such as augmented reality, providing visitors with an immersive viewing experience.

Newly added art pieces, including oil paintings, sculptures and Chinese paintings, are also one of the highlights of the exhibition, according to Tong. Among the works is a famous painting by Zhang Peichu which shows representatives attending the 4th National Congress.

The first daily newspaper in the history of the Communist Party of China and 14 congress documents are also on display.

The memorial hall has also dedicated space to hosting Shanghai's first national flag education exhibition, which displays precious historical materials such as the design manuscripts, and calligraphy and painting of Zeng Liansong, the designer of the national flag.