Ethnic Dong people dance in the front of a drum tower during a celebration in Jiangkou county, Guizhou province.[Photo provided to China Daily]

Yang Yuanju's family offers ritualistic sacrifices to their ancestors in a 19-story drum tower in the village center on Chinese Lunar New Year's Eve.

The buildings - constructed with notched boards and not a single nail - are central to ethnic Dong life in every sense. They're the anchoring landmarks that soar over every settlement - even the tiniest hamlet.

It has been this way since time immemorial. Nobody knows when the ethnic group erected the first. Their language is without written form.

But oral history declares that whenever and wherever Dong have settled, there has been a drum tower.

The buildings are believed to have initially served as alert-broadcast systems for village chiefs, who'd become percussionists to implore the people to convene because of invasions or to call town-hall meetings.

Most are over 20 meters wide. They're built without blueprints with timber each family donates.

Yang and her husband run a restaurant at the Fanjing Mountains' foot in Guizhou province's Jiangkou county.

The 42-year-old says many from her community's 62 households rehearse Dong dances and dramas in the drum tower's square.

It hosts a 40-member dance troupe since the area has recently won recognition for its ecology, anthropology and scenery.

Guizhou in 2016 for the first time earned a spot on the New York Times' top "52 places to go" list for its "unhurried pace" and "authentic feel".