I've been to the Old Mormon Fort before but I went back today to see the Helen Stewart statue that was dedicated last December--a dedication I couldn't make because of a conflict.
If you are interested in Las Vegas history, this is a must visit sometime as this is where the town started along the Las Vegas Creek. After the Mormons abandoned the camp, it was first the home of O. D. Gass and then Archibald and Helen Stewart. I have always admired Helen Stewart--she's called the First Lady of Las Vegas--so taking the time to see her statue was a must do.
There are some things to see in the small museum and you can walk around the grounds and in one of the buildings see the only piece of the original fort that survived. A little under whelming but it's there nonetheless.
Admission is only $1 so it won't break the bank. Go and enjoy!