The whole poem:
白日依山尽，
黄河入海流。
欲穷千里目，
更上一层楼。 'The white sun sinks behind the hills, the Yellow River flows into the sea. To see a thousand li further, climb one more floor.' The tower stood at Puzhou in Shanxi, above the Yellow River; it was lost in the wars of the Yuan and rebuilt in 2002.
