This totally insane room is in the Opera, and is definitely a fine example of overendulgance. Not to mention a lot of time spent by many people to make the freaking thing.
Gould's Book Arcade, Sydney
This massive book warehouse in Newtown is guaranteed to be hiding your new favourite novel, you just need to have the time and patience to find it. Gould's specialises in second hand and out-of-print works, and has become a Sydney institution.