I would hesitate to call them sanctuaries, because they really are more like square boxes. Many of the new worship spaces are stripped of religious symbolism. Their stark, bare appointments are far different from our own sanctuary. Worship in many nondenominational churches has gone high-tech, with lighting, sound and media technologies rivaling secular theaters. Their music is definitely a performance.
Every worship includes a dramatic skit, intended to evoke humor while augmenting the sermon.
Often high-tech media is deployed projecting images on giant screens before the audience. Sermons are minimal, sometimes interpreting the dramatic skit, they focus upon relevant life-topics. Many conservative pastors have reduced preaching to biblical exposition. The focus is upon the horizontal, with feel-good sermons that induce no guilt, and helpful encouragement with everyday problems. We actually offer that at First Baptist Church through the B'Jazz Vespers.