In the Wudalianchi Scenic Area of Heilongjiang Province, there is a saying of four stranges and four stranges, among which the strange landscape known as three volts for ice and snow is the local crystal palace. The Crystal Palace is also called the "ice cave". The cave wall is a variety of strange-shaped lava flow marks. The top of the cave is a lava stalactite that is drooping down. It is because the volcanic eruption of the magma is exposed to cold air during the flow. A landscape of frost melting formed by the action. The summer frost is now, the hot ice is engraved. The average temperature in the Crystal Palace is minus 5 °C. If the frost of the jade is spread all over the hole, it will be crystal clear, adding a bit of softness and delicate beauty to the rough underground cave. The ice does not change all the year round, and the colored ice sculptures make people feel like they are in a fairyland.