Yumbulagang, reputed to be the first palace in Tibet history, is considered the oldest building in Tibet. Lying 12 kilometers southwest of Tsedang, it perches on a small hill east of the Yarlong River. The soaring building is a legendary palace built in the 2nd century by the Bon followers, for the first Tibetan king - Nyatri Tsenpo, who was said to have descended from Heaven. Later it became the summer palace of Songtsen Gampo and Princess Wencheng. Legend has it that in the fifth century, a Buddhist sutra fell from the sky onto the roof of Yumbulagang. Nobody could read the book. However a sage predicted it would be interpreted between 7th and 8th century, and the sutra was kept secured in the palace. After Songtsen Gampo transferred his capital to Lhasa,Yumbulagang became a chapel and was converted to a Gulugpa monastery during the reign of the Fifth Dalai Lama.

Tibet kings and their ministers are enshrined in a small chapel. Upstairs is a small chanting hall, which houses Sakyamuni and Chenrezi. A mural gallery above tells Nyatri Tsenpo's arrival from the sky and other stories about him as well as on other aspects of Tibetan history.

Yumbulagang offers a stunning view of the patchwork fields of Yarlung Valley. To enter Yumbulagang Palace, you need to pay 60RMB as a entrance fee. Yumbulagang is 6Km from Trandruk Monastery and you can take No.2 bus, which is originating from the Tsetang roundabout and passing Trandruk.