It's a dam. Beavers have been making them since the beginning of time. I get it. You get it. BUT this particular dam -- well, it's damn impressive. It's engineering genuinely leaves you in awe ... considering it was built right smack in the middle of the depression.
It's right smack in the border of Nevada and Arizona -- so you definitely want to come here if you're ever on your way to Vegas or going to Lake Meade. Make sure you take the guided tour -- it's worth it. Plus, you'll understand why it's a big freaking deal.