What are the specific introductions of the four ancient academies?

The four academies are introduced as follows:

1. Bailudong Academy: Lushan Bailudong Academy, located in the southeast of Wulaofeng, is one of the four major academies in China. Founded in 940 AD, the Academy began in the Tang Dynasty and flourished in the Song Dynasty, following the Ming and Qing Dynasties. It has been 1000 years. Bailudong Academy has a mountainous area of 3,000 mu and a building area of 3,800 square meters. The existing buildings are built in series from west to east along the west of Guandao Road, and are composed of building communities such as Academy Portal, Ziyang Academy, Bailu Academy and Yan Hotel. The buildings all face south, with stone or brick-wood structure, and the roof is a herringbone hard peak, which is quite elegant and indifferent.

2. Yuelu Academy: Yuelu Academy is located at the foot of the beautiful Yuelu Mountain on the west bank of Xiangjiang River in Changsha City, Hunan Province, on the campus of Hunan University. Founded in the ninth year of Kaibao in the Northern Song Dynasty. It is one of the four famous academies in China and one of the oldest universities in the world. Yuelu Academy has continued the tradition of education and academic research for thousands of years, and has become a typical representative of the traditional functions of national academies, and has been praised as the "Millennium Academy" by the outside world.

3. Yingtian Academy: Yingtianfu Academy, also known as Yingtian Academy, Suiyang Academy, Nanjing Academy, Du Nan Academy and Nanjing imperial academy, is located in Nanhu, the ancient city of Shangqiu, Suiyang District, Shangqiu City, Henan Province, and is one of the four famous academies in ancient China. Yingtianfu Academy, formerly named Suiyang Academy, was founded by Yang Yun, a native of Shangqiu in Jin Dynasty and Five Dynasties. It is located in a bustling downtown area with a lot of talents. Yingtianfu Academy, with the participation of Yan Shu and Fan Zhongyan, gradually developed into an influential academy in the Northern Song Dynasty.

4. Songyang Academy: Songyang Academy, located at the foot of Jijunfeng, 3 kilometers north of Dengfeng, Henan, was named after its location in Song Zhiyang. The scenic spot is a famous institution of higher learning in ancient China, one of the four ancient Chinese academies, and an integral part of the world cultural heritage and world historical buildings. The organizational system of Songyang Academy is simple and elegant, and the main buildings on the central axis have five entrances and corridors. Its unique architecture has the nature of Confucian education.