Okay, so I was looking Myst Uru pictures on Google, and saw that it was possible to get into the big volcano in New Mexico. Plus a bunch of other places that I had never been. Well, I started looking and discovered that it was due to a developer tool called Flymode!
Now with the demise of Uru Live (which I never got to experience), I found that this tool is pretty rare out there and most websites have been taking them down. However, I found that someone on the UruObsession website found it and posted it on SendSpace. The flymode tool can be found here, thanks to highwaykind.