This is an interesting photo. I took it while traveling near Las Vegas, Nevada back in 2006. I showed it to a friend, and she asked me where I found this underground city. I was confused for a minute, and she repeated the question. So I asked her to elaborate on where it could be, and she had no idea.
I’ll let you in on a little secret: it’s not an underground city, but Hoover Dam at night. This was before the new bridge was completed, they had just started working on it actually, so all traffic had to go across the dam.
I was traveling to the Grand Canyon after spending my days off in Las Vegas, it was late at night, and I saw the dam, and was blown away at how amazing it is at night. It’s not often I’ve seen anyone photograph it at night, so I made several attempts before I came away with this gem.