(commonly known as the Old Fort) The first permanent non-native settlers in the Las Vegas Valley were a group of Mormon missionaries who built an adobe fort along Las Vegas Creek in 1855. They successfully farmed the area by diverting water from the creek. Today, the park includes a remnant of the original adobe fort, which serves as a Visitor Center with interpretive displays. The Visitor Center contains exhibits on the history of the site, as well as historic artifacts. Historic interpretation is and will remain the focus of the park. The Old Fort is open Monday through Saturday, 8 am to 4:30 pm. Admission is $1 for adults and teens, children 12 & under free.