A video on the Battle of Little Bighorn. America's expansion, it's Manifest Destiny, and the American Civil War led to the rise of military forts throughout the west. It also led to conflicts with the Native Americans, and Mexicans. It was a breeding ground for outlaw bands as well.
I have this pinned but this is a much bigger picture. This abandoned farmhouse is in rural West Virginia.
Falkenstein Castle (Austria) Also called Neu-Falkenstein, is a ruined castle in Rosenheim. The hill fort is located at the foot of the Hohen Madrons and Petersberg. The castle was founded probably in the 13th Century.