Keystone

Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States.  It had its origins in 1883 as a mining town, and has since transformed itself into a resort town, serving the needs of the millions of visitors to Mount Rushmore National Memorial, which is located just beyond city limits.

The town took its name from a local mine, which most likely was named after the keystone Masonic symbol.

Things you can doo in Keystone : You can visit Devils Tower, Devils Tower rises 1267 feet above the Belle Fourche River. Once hidden, erosion has revealed Devils Tower. This 1347 acre park is covered with pine forests, woodlands, and grasslands. Deer, prairie dogs, and other wildlife are seen. Also known as Bears Lodge, it is a sacred site for many American Indians. President Theodore Roosevelt proclaimed Devils Tower the first national monument in 1906.

Also, For over 50 years The Stables at Palmer Gulch has provided fun trail rides into the most beautiful places in the Black Hills National Forest.
Guided ridesare offered multiple times daily from Memorial Day to Labor Day.
The chuck wagon supper is an open-air show that takes place in a remote mountain meadow.
You’ll choose to ride to the show on a good saddle horse OR on a horse drawn covered wagon.
You’ll enjoy a real cowboy music show performed by local ranchers. Watch a real Dutch Oven cook grill Dakota grown beef steaks over an aspen-wood camp fire and enjoy delicious side dishes prepared fresh right off the Chuck Wagon.
The Stables at Palmer Gulch is just minutes from Rapid City, Deadwood and Custer State Park! Centrally located 5 miles west of Mt. Rushmore and Keystone.

Source:
https://sh.wikipedia.org/wiki/Keystone,_South_Dakota
http://www.keystonechamber.com/