This may be one of the most scenic drives in the US! And the driving is unbelievable to boot.
The Beartooh Hwy is only open from June to Oct/Nov and closed the rest of the year due to snow. The pass is at nearly 11,000 ft with breath taking scenery at every turn (too many turns to count ).
You can start from Red Lodge, MT and end up at either Cody, WY (by taking the Chief Joseph scenic hwy or go directly to Yellowstone Park via Cooke City- either way you won't be disappointed.
Your brakes should be in top notch condition as you gain/lose lots of elevation throughout.
Pic near the top