What is "huaigu"

Huaigu . is one of the Classical Chinese poetry genres. The huaigu is a type or style of poem, in which the poet looks back at some bygone time(s), place(s), or person(s), and the poem may be written in any of the Classical Chinese poetry forms. This is "one of the perennial themes of Chinese poetry," according to Burton Watson, in which "the poet contemplates the ruins of past glory."