If the players own the PlayStation 3 version and unlocks all the 17 chapter completion trophies, they can look at their trophy list and those unlocked trophy pictures and if they lined them up from top to bottom: "Prologue Complete" to "Chapter 16 Complete", it will reveal the complete huge structure, Basel. The game's main location.
When this game was released outside Japan, the localization team had to change the name to Resonance of Fate in order to avoid confusions and copyright issues to the novel with a similar title, "The End of Eternity" written by Isaac Asimov.