Before his arrest in 2009, Nobel Peace Prize laureate Liu Xiaobo would write a poem every year to commemorate the 1989 Tiananmen crackdown.

The poems have been translated into English by Jeffrey Yang and published in the compilation, "June Fourth Elegies."

I talked to Yang about Liu Xiaobo's poetry, and the power of poetry to remember an event that has been publicly erased in China.

In an unassuming office building in Hong Kong, is the world's first museum dedicated to the Tiananmen crackdown of 1989.

Let's go inside.