Yumbu Lakhang, an ancient structure in the Yarlung Valley in Tsetang Town, Shannan Prefecture, in southern Tibet Autonomous Region of China. According to legend, it was the first building in Tibet and the palace of the first Tibetan king, Nyatri Tsenpo. Later, Yumbu Lakhang became the summer palace of the Tibetan king Songtsan Gampo. [China.org.cn]