I've seen "Mystere" as well, at Treasure Island.
A really unusual experience for me was a behind the scenes tour of
The Studio at Cirque Headquarters, their state of the art facility in Montreal where the performers live and train.
At one point they got me walking on the wire mesh net "catwalk" that is essentially a wire grid drop ceiling in the 23 metre high training room, while the trapeze artists were working out below me. Talk about acrophobia!