The Watch Tower at Desert View we were told was designed to provide an elevated observation point in which to see the canyon as well as a way to show early visitors the American Indian way of life. Literature provided explains that:
The Watch Tower is not a restoration or copy of any particular Indian building, but a re-creation of the strange prehistoric towers found scattered over large areas of the Southwest. Months of research by Mary Colter proceeded the actual construction, which took three years.
from, Young Snowbirds travel blog