Wine aficionados dream of a dedicated cellar, pool sharks a billiards room, book lovers a classic library. Now, thanks to technological leaps, golf junkies can live out their own indoor fantasies by installing a practice range with the world’s best golf courses inside their homes—just as many top PGA Tour pros have already done. Today’s ball-flight tracking “launch monitors” often combine multiple military and civilian technologies, from high-speed 3-D cameras to Doppler radar, accurately predicting the results of shots, while improved video quality and GPS course mapping make the on-screen experience much more realistic. Golf simulators basically allow you to see a hole on the screen in front of you, tee up a driver, and let it fly into the screen. The tech analyzes your ball speed, loft, angle, and spin to determine where it would land on the course in real life, and then the software takes you virtually down the on-screen fairway to the location where you hit your next shot. For game improvement, you can practice at the “range” and get the kind of swing analysis offered at top golf academies, working on improving consistency, distance, shot shape, and critically analyzing minor tweaks or swing changes. Top simulators vary in terms of features and the slate of courses they allow you to play, but the best are more realistic than ever and typically include bucket-list rounds like St. Andrews or Pebble Beach. Most require custom installations, similar to an elaborate home theater.