It was pretty cool to learn that a long time ago Guilins' landscape was submerged underwater, hence the mountains being made of limestone. After all the water drained and eroded the lands for over thousands of years, the unique karst mountains were formed. Even better, animal fossils and unique rocks from as back as the stone age period have been perfectly preserved in these mountains, and are available at this museum.(i'm not too sure if they are the originals, cause i doubt that they can trust a 6000 year old fossil to the public). All in all it doesn't hurt taking a stroll through the museum after a fun ride up the Yao mountain by cable car.