For those into Los Angeles Theatre, the Center Theatre Group has put up four YouTube videos on the upcoming renovation of the Mark Taper Forum, built in 1967. I found them fascinating, as they go through the entire theatre, pointing out its flaws and what is being done in the renovation. It gives a really good view of all the hidden stuff you never think about when you see a show.
Video 1: The Front of the House
Video 2: Backstage
Video 3: The Grid above the Stage
Video 4: The Secret Room Upstairs