I thought perhaps I could link to an explanation of Cache Across America. Here's what was in their forums. It will not surprise you that he's picked up a few. ;) Just wait, he'll comment here...he can't resist.
"So wouldn't it be cool if there was a 50 state multi-cache? You know, a cache with a waypoint in each and every one of the 50 states. It would be the granddaddy of all multis and would be a long-term target of only the truly obsessed. It would be something that would take years to collect the stages of."
The Colorado cache did not disappoint. This was just outside Boulder, in the mountains ofcourse.
As I saw climbers, I had to photograph this wall. Oh, my. Uhm, no. My fear of heights could not and will not be overcome to climb such as this. The thing it captured that I loved the most was the color. I didn't edit that picture other than to crop it down for the web. The sky really was that blue. Now, if I were gonna go all safety patrol, I'd mention the lack of protective head gear on any of the climbers we saw...I said IF. ;)

Since I was a little on the paranoid side of the rushing water, the kids could come out one by one, WITH me, holding on to them. Al was first. She decided that no, she did not want to sit on the pretty rock. Probably because she knew she'd have to get back into the car. She loved getting to touch the river water and seemed surprised at how cold it was.

Yes, the look of thrill on Giuliana's face was there the whole time she was out of the car. If I'd have allowed, she would have gone to fetch the cache with Angelo. It involved going across a rock slanted toward the water. Not high on my comfort level for her.

Tre was patient, singing along with his MP3 player until it was finally his turn. He cracked us up to no end with his singing along (think U2 Bloody Sunday and him singing what he thinks are the words) and making a fleet of paper airplanes (he's really quite talented). Since Daddy was done with the cache, they took a little more of a walk than the girls and I did. Which ofcourse was fine- I got great pictures. I cropped out a bit of the scenery on this one.