??? is the name of a location in the Maxima version of World of Final Fantasy, located on the "Nibelheim" continent in Grymoire. It is one of six unmarked locations on the world map that can only be reached by airship, accessible after reading a message inscribed on the tombstone at the mysterious location within The Crystal Tower. On the world map, its location is situated atop the volcanic peak near Valley Seven.
The location consists of only one room and resembles the Secret Cauldron of Valley Seven. At the end of the room is a Puzzle Switch that must be activated to break a seal required to encounter The Immortal Dark Dragon back at the mysterious location. The Puzzle Switch is referred to as the Fire Seal and requires a stack with the combined weight stat of 15 of higher, and Fire elemental resistance of 150 or higher to activate it.
"Labyrinth of Fire" is the background theme that plays in this area.