Before I moved to Wyoming, if you'd asked me to describe a western fort, this would have been my answer: buildings made of logs, all surrounded by a stockade fence.
I soon discovered that not all forts were like that, but some were, including this one. Fort Caspar near the town of Casper -- notice the different spellings -- is a reconstructed 1865 military post.
In addition to the buildings, which include barracks, officers' quarters, a stable, and much more, there's a small museum, all of which make it worth a visit if you're in the area.
If you'd like more information, you might find this link helpful.