Fort Mckeen was located on the hill overlooking Fort Abraham Lincoln and the Missouri River ca. 1872-1891) The block house was reconstructed by the Civilian Conservation Corps in the 1930's.
"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do.
So throw off the bowlines.
Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."