Rapid City, South Dakota
@Patricia Nickens Derryberry Rapid City Apparently, Devils Bathtub is one of the best hikes in Spearfish Canyon. Article says if you have time to do some hiking - do this one. Family friendly, although, you may have to carry the younger kiddos as this is steep and can be slippery. Reminds me of the Ledges.
Cosmos Mystery Area in Rapid City, South Dakota - Situated just six miles from the Mount Rushmore National Monument, the Cosmos Mystery Area on Hwy. 16 features a house where no one appears to be able stand up straight. A ball placed on a plank will appear to roll up it. "You can even stand on the wall!" says the promotional literature.