The term 'Oregon Trail Sights' refers to the various sights encountered by travelers on the Oregon Trail, a 2, 170-mile long historic east-west, large-scale emigrant trail in the United States that connected the Missouri River to valleys in Oregon. The crossword solution for this term is 'WAGONS, ' which refers to the WAGONS used by the settlers on the Oregon Trail. These WAGONS were typically pulled by oxen or horses and carried all of the settlers' belongings, including food, clothing, tools, and other supplies.