
While in Las Vegas I took a tour of Hoover Dam, built from 1930-1935. Being there in person is the only way to comprehend the scale of it. For instance: Lake Mead contains enough to keep Pennsylvania (a state that takes forever to drive across) under a foot of water. We took the underground Power Plant tour and walked through rocky tunnels, previously used to divert the river during construction, to see the massive turbines used to generate electricity. At one point you're standing in a vibrating room — vibrating because you're standing above a 30 foot pipe used to deliver 90,000 gallons per second to the generators. Everything here has a wonderful Art Deco feel; they don't craft government projects like they used to.

That's one fine dam photo.

Murals in the Visitor's Center.

This archway in progress across the Colorado River will support the new bypass roadway for trucks. It's incredible to wind around the corner of the switchback roads and suddenly see these giant concrete arches suspended in the air as crews work to connect the two ends.

The vibrating room atop one of the 30 foot penstock pipes. Looks sort of like that beam-focusing room in the Death Star when they're destroying Alderaan.

Intakes on the Lake Mead side. The calcium ring around the mountains is from a high water mark in the 1980s where the lake would have washed over the dam if it weren't for the spillways on either side.