Pandaemonium (Final Fantasy II)

Pandaemonium is the final dungeon of Final Fantasy II. The capital of Hell, it has been risen to the surface by the Emperor.

Story
Many centuries ago, a great hole opened in the world, and many monsters spilled out. After them, the palace of Hell, Pandaemonium, rose from it. The people, fearing for their lives, made the ultimate spell, Ultima. Using this spell, they managed to seal the palace back from where it came. However, the monsters still remained, and the mages who cast Ultima, fearing their new power, went away and founded the town of mages, Mysidia, in a secluded area. Here, they sealed the Ultima Tome away, so that no one else could use its power.

After the party kills the Emperor, his soul goes to Hell. Here, he absorbs the dark powers, and becomes Emperor of Hell. Using his new powers, he is able to raise Pandaemonium to the Earth again, where Palamecia used to stand. It could be theorised that Palamecia was built on the exact spot where Pandaemonium rose all those centuries ago.

The party travels through the Jade Passage, and arrives in Pandaemoium. Here, they travel to the top and find the Emperor. They manage to defeat him in battle, and with his powers now gone, Pandaemonium once again sinks back into Hell.