Films? Geography? History?
Parts of How the west was won, Hidalgo, several episodes of Gunsmoke, Bury my heart at wounded Knee. Many other well and lesser known films.
The Black Hills are geologically unique in the world. The badlands are the result of fantastically swift erosion from the then 19000' high hills into that then 2000' lower inland sea.
History is an other aspect that had, has a massive impact on what makes America. The black hills gold rush led to the great indian wars, to massacres, broken treaties on both sides to inequality that exists to this day.
To see the Black Hills, to take with you an iota of understanding ? Plan on months. I dont have it all after 45 years.