When you come to Yan'an, you must go to the old site of Zaoyuan Revolution. The park is very large. It is not too many people. It is worth a visit. It is more interesting. It is a cave cave. The cave caves in northern Shaanxi are very distinctive. Most of them are built on the mountain. The soil is relatively loose and extends inside. A lot of space can be opened up. The earth kiln in the garden is much better than the cave caves on the outside mountain due to regular maintenance.