Photo taken on Jan. 1, 2021 shows girls in traditional festival costumes playing at the Yemeni historical Dar Al-Hajar (Rock Palace) in Sanaa, capital of Yemen. (Photo by Mohammed Mohammed/Xinhua)

Photo taken on Jan. 1, 2021 shows the Yemeni historical Dar Al-Hajar (Rock Palace) in Sanaa, capital of Yemen. (Photo by Mohammed Mohammed/Xinhua)

A girl is seen at the Yemeni historical Dar Al-Hajar (Rock Palace) in Sanaa, capital of Yemen, on Jan. 1, 2021. (Photo by Mohammed Mohammed/Xinhua)