Declared the fastest-growing metropolitan area in the U.S. in 2018, St. George, Utah, and its environs have long ranked high on my list of places to vacation.

From limestone pinnacles in the arid desert to a high forested plateau near the road's 9,000-foot summit to remnants of a prehistoric village, state Route 12 offers an unparalleled driving experience.

Utah, like many US states, abounds with natural beauty, but its most refreshing secret offers swimming opportunities framed by dazzling desert views.