Seyuan Garden boasts the best air quality in Nantong. [Photo/Official WeChat account of Langshan National Forest Park]

Built in 1924, Seyuan Garden is one of the largest botanical gardens in Nantong, East China's Jiangsu province.

The garden is home to more than 10,000 types of rare trees from over 200 species and is considered a “natural oxygen bar”.

It is where Zhang Jian, a well-known local business magnate and leading academic in modern China, is buried. It is also a key cultural relic under State-level protection.

The garden not only offers a great place for people to escape the hustle and bustle of the city, but is also home to many birds.

From March to June is the best period to admire the birds, and the garden has attracted many bird lovers.