Holly and I visited Las Vegas in January 2000 (for the Consumer Electronics Show). While there, we visited the Hoover Dam and took the behind-the-scenes “hard hat tour.”
Click the image above for the full album.
The hard hat tour was great: we got to walk through the powerhouse and the dam itself, including inspection tunnels that let us look out directly from the front of the dam. Sadly, this tour is no longer available, lost to post-9/11 security paranoia.