Important cultural buildings and other supporting facilities in a city or region. Three museums and one center usually refer to comprehensive cultural facilities including libraries, museums, cultural centers and theaters. This concept is mainly used to describe the important cultural buildings in a city or region, and sometimes it also includes other supporting facilities, such as science and technology museums and tourist service centers. The construction project of "Three Libraries and One Center" has been implemented in several cities in China. For example, the "three museums and one hospital" project in Nanyang, including the municipal museum, cultural center, library and Nanyang Grand Theatre, has become an important cultural landmark in Nanyang.