Continuing the theme of our other 2 stop sign caches up north Hwy 385, this one might really make you go hmmm... I mean, seriously. Take a good hard look here at the cache site when you stop here. Why would there be... oh never mind. We don't want to spoil it for you yet. You really need to see this one for yourself.
Cache is a park and grab at the 3 way intersection of Hwy 89 north to Custer, and Hwy 18 east to Hot Springs and south to Edgemont. There's plenty of room to pull off to park, contemplate the situation, grab the cache, and then on to whatever your destination might be. Just be sure to obey the applicable traffic flow signs.
You may need a TOTT or similar device to reach the cache if you're short. Use appropriate stealth if necessary, and please return the cache where and how you found it.
Have fun, and enjoy!