Hoover Dam

Straddling the Nevada-Arizona border, this National Historic Landmark carved into Black Canyon serves as both a functional hydroelectric power plant and a monument to early 20th-century construction. Visitors can traverse the site via guided tours into the active powerhouse and original construction tunnels or take in panoramic vistas of the Colorado River and Lake Mead from the observation deck. The visitor center houses historical exhibits detailing the scale of the engineering feat. Note that the experience involves narrow passages and elevator transit, which may be challenging for those with claustrophobia. Tours are conducted in an industrial environment, with specific clothing requirements and age restrictions for unaccompanied minors.