Hoover Dam from 3 Views -
These tally marks are at the very center point of Hoover Dam's inside 700 step staircase. The tour guide said their history has been lost over time. Any idea what they are? :
Inside the Hoover Dam Powerplant - Nevada Side | Hoover Dam … | Flickr
What's inside The Hoover Dam?
File:Generators Inside Hoover Dam, The Tour (3467682551).jpg - Wikimedia Commons
Tour Experience: Exploring the Wonders of the Hoover Dam
Hoover Dam Tours & Tickets | Hoover Dam Visitor Center
Hoover Dam | Description, Location, Constructino, Facts, History, & Pictures | Britannica
INSIDE The Hoover Dam - A VIP Tour!
Inside Hoover Dam | David Herrera | Flickr
Hoover Dam Information | Lake Mead | Travel Nevada
Inside the Dam - Picture of Hoover Dam Tour Company, Las Vegas - Tripadvisor
What's Inside The Hoover Dam?. The Hoover Dam is one of man's most… | by Dan Markham | What's Inside | Medium
File:Hoover Dam, the interior (7859539070).jpg - Wikimedia Commons
The turbine room inside Hoover Dam as seen Thursday, March 20, 2014 at Hoover Dam.Almost two-fifths of the workforce at the federal facility is expected to retire within the next five years. (
The inside of the Hoover Dam in Nevada image - Free stock photo - Public Domain photo - CC0 Images
What does the bottom of the Hoover Dam look like? - Quora
75 Inside Hoover Dam Stock Photos, High-Res Pictures, and Images - Getty Images
Inside hoover dam hi-res stock photography and images - Alamy
