In Final Fantasy IV, you will eventually be able to explore three worlds. There is the Overworld,
where most of the story takes place. Then you will find yourself in the Underworld, Dwarves,
and Summon Lords. And then finally the Lunar World. Little is known about
the Lunar World. However it is clear this is where destinies are born and destroyed.

Overworld

1- Baron Kingdom 2- Myst cave 3- Myst Village 4- Kaipo 5- Underground Waterway 6- Damcyan Castle 7- Antlion Cave 8- Mt. Hobbs 9- Fabul Castle 10- Mysidia 11- Mt. Ordeals	12- Troia Kingdom 13- Chocobo Village 14- Magnetic Cavern 15- Agart 16- Mythril 17- Eblan Castle 18- Eblan cave 19- Babel Tower 20- Chocobo Forest 21- Adamant Grotto 22- Cave of Trials

Underworld

1- Dwarven Castle 2- Dwarven Cave 3- Babel Tower 4- Sylvan Cave 5- Cave of Summons 6- Tomra 7- Kokkol's Smithy 8- Sealed Cave

Lunar World

1- Crystal Palace 2- Cave of Bahamut 3- Hummingway Home 4- Lunar Ruins