Crystalmount is a mystical place high above the Mob Building. Instead of ground, you walk on clouds, and everything around is happy and colorful. It is a land up in the clouds where there are no rules, no limits, no bushy mustaches, and no bedtimes. Most of all the inhabitants are happy and dancing all the time, having fun. The way to access it is riding an aircraft, traveling up a rainbow, or using a teleporter. It is a replica of the LEGO Movie's "Cloud Cuckoo Land", but much bigger, and actually exists.
Inside the big, purple puppy head is actually a rather small palace. It has huge windows to let in the sunshine and happiness, and seats surrounding the middle. It's where speeches are held, or where stuff goes down.