I just played one today...Riverside GC in Austin. An old Maxwell course, once home to Austin Country Club, home to Harvey Penick for many, many years, and where Crenshaw and Kite learned the game. 10 and 11 are back-to-back par 3's. In fact, 11 is the last par 3 on the course, pretty rare I'd say. They are followed up by back-to-back par 5's at 12 and 13. Very, very rare, I'd say. The two holes are the exact same length, 179 from the back, but play parallel to each other so they don't feel exactly the same, thanks to wind direction, etc.