I used to train at a place called BARA Farms in Colorado Springs. It had two indoor rings (one for dressage and one for jumping). The barns were gorgeous passive solar barns. Very fancy place with its own aqua treadmill, breeding barn etc.
Sadly, after I moved east, it was sold a couple of times. It is now called Cactus Creek Ranch, and is looking somewhat beat up. Too bad.
Here is what it looks like now; Cactus Creek Ranch, LLC
Still a pretty nice place.