|NATIONAL PARKS QUICKLINKS|
From the visitor center start hiking east along the Historic Railway Trail, paralleling Lake Mead on the left and open desert on the right. In 1 mile, begin to head through five separate tunnels blasted into the Aztec Sandstone Mountains in the early 1930's to let trains pass through en route to Hoover Dam. The tunnels, now restored by the National Park Service, are 25 feet high, and provide cool damp shade against the hot desert sun. After passing through the final tunnel, continue 1.6 miles, descending 300 feet to Hoover Dam. Depending on time, check out Hoover Dam visitor center and even take a tour of the dam. To finish, simply make a u-turn and retrace your steps.