I saw on Ariel America the other day that Tiger's place in Isleworth has an indoor/outdoor range with 3 different type of turf/grass on the greens to simulate how the ball reacts on the different types he might play throughout the year. Guessing Bentgrass, Poa Annua, Bermuda. Probably extremely useful for judging how the ball rolls out on pitches/chips/putts.
Has a simulator indoors, but can press a button and the outside wall slides open so he can hit from inside (protected from weather) to the outdoor greens to see real ball flight/landing/rollout.