Ah, big listening spaces, something worthy of showing off. My favorite big space is outdoors. I've shared these pictures here on AK before, but why not again?
First, the Dream Dominion:
Speakers are about 50 feet apart, and I sit about 50 feet back.
Here's a satellite picture of this setup:
A different location for the same system:
And other smaller systems outdoors:
I do actually have a stereo indoors as well (for rainy day and winter listening). The room is 20'x30', not sure if this qualifies as a big listening space: