1 Best Sight in Phoenix, Scottsdale, and Tempe, Arizona

Flanked by the desolate Mazatzal and Sierra Anchas mountain ranges, Theodore Roosevelt Lake Reservoir and Dam is an aquatic recreational area—a favorite with bass anglers, water-skiers, and boaters. This is the largest masonry dam on the planet, and the massive bridge is the longest two-lane, single-span, steel-arch bridge in the nation.