Where is Sazerac? Am trying to recall . . . did you find an area by one of the buildings that had three chests together?

Emilyh,
Just keep trekking around the building, there are two entrances with levers but only one works from the outside at this point in your adventure. Later, when you use one of the glowstones inside the city, the other entrance will become active.
: )
Moni

I finally found the city but can't get through the first door (the one after you pull the lever and go through a tunnel.) There appears to be no switches or buttons, casting spirit eye didn't find any objects to use. Is there another entrance or am I missing something completely obvious?

There is another entrance to the collaseum. It is kind of around the corner and down below one of the large buildings. If you are where I think you are the tunnel after the lever went straight then right? Although I remember a place on the wall (a "lock") on the left of the door that requires a glowstone . . .

There was no lock on the door that I could find.