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The game might have something like randomly generated or changing dungeons:

The underground of Yharnam, vast ruins built over several levels. They’re terribly old, perhaps made by people according to their purpose. They appear to be a grave, or maybe just a place where something rests.
And, these ruins, it is said they change appearance depending on the person that sees them.

http://www.dualshockers.com/2014/11/20/ps4-exclusive-bloodborne-could-have-randomly-generated-dungeon-feature/