These are the abandoned railroad tunnels that were used by trains to ship materials for the construction of Hoover Dam. They are immensely popular hiking trails, because they are level and interesting. To get there take the 93 until you get to the Lake Mead off ramp. Take it, and the first parking lot on your right (do not drive into the parking lot of the visitors center) will be the parking lot for those who want to hike the trail. If you hike all the way to the end you will wind up on the top floor of the Hoover Dam parking garage.hihttp://www.nps.gov

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