What were the four major projects in ancient China?

Shi Gan Xing Jing is an astronomical monograph and observation record in ancient China, and it is also one of the earliest astronomical works in the world. It is the earliest catalogue in the world, about 200 years earlier than the first catalogue in Europe compiled by the Greek astronomer Ibagu in the second century BC.

2. The Great Wall

The Great Wall, also known as the Great Wall of Wan Li, is an ancient military defense project in China. It is a tall, solid and continuous long wall, which is used to limit the enemy's riding. The Great Wall is not a simple isolated wall, but a defense system with the wall as the main body and a large number of cities, obstacles, pavilions and landmarks.

3. Beijing-Hangzhou Grand Canal

The Beijing-Hangzhou Grand Canal is the longest and largest ancient canal in the world and one of the oldest canals. Together with the Great Wall and Karez, it is called the three major ancient projects in China.

It is a great project created by the working people in ancient China and one of the symbols of China's cultural status. The canal has played a great role in the economic and cultural development and communication between the north and the south of China, especially in the development of industrial and agricultural economy along the route.

4. Guangxi Lingqu

Lingqu, called Qin Interception Canal, Lingling Canal, Douhe Canal and Xing 'an Canal in ancient times, is a great project created by working people in ancient China. Located in Xing 'an, Guangxi Zhuang Autonomous Region, it was opened to traffic in 2 14 BC.

Lingqu from east to west connects Haiyang River in the east of Xing 'an (the source of Xiangjiang River flows from south to north) and Darong River in the west of Xing 'an (the source of Lijiang River flows from north to south). It is one of the oldest canals in the world and has the reputation of "the pearl of ancient water conservancy buildings in the world".

5.Potala Palace

Potala Palace, located on Maburi Mountain in the northwest of Lhasa, the capital of Xizang Autonomous Region, China, is a palace-style building complex, which was originally built by Zapusong Zagambu of the Tubo Dynasty to marry Princess Wencheng. /kloc-after reconstruction in the 0/7th century, it became the residence of the Dalai Lama's Winter Palace and the ruling center of the integration of politics and religion in Tibet. 196 1 year, Potala Palace became one of the first national key cultural relics protection units of China people and the State Council. 1994, Potala Palace was listed as a world cultural heritage. The main buildings of Potala Palace are the White House and the Red Palace.

The whole palace is in Tibetan style, with a height of more than 200 meters. The appearance is 13 floors, but actually there are only 9 floors. Because it was built halfway up the mountain, a large area of stone walls stood like walls, making the building seem to be integrated with the hills and magnificent.