At Field Club of Omaha, after holing out on the 5th, you tee off on the 7th, then proceed to play the 6th. Once you finish the 6th you walk to the fairway on the 7th, find your ball, and play on.The 6th hole, a par 3, parallels the 7th hole, a par 5, with both tees next to each other just off the 5th green. If you played in order you'd obviously have to backtrack.
FCO has 6 road crossings on a tight property. Regardless of its limitations, I've never heard of another course doing this. Has anyone heard of something similar?