Wow, such color!
You would think that these colors came from me dragging my sliders all the way to the right, but they didn't. It really looks like this. This is the Grand Prismatic Spring in Yellowstone National Park, and it's magnificent. There is a boardwalk to wander on here, and even with the summer crowds you can get your shots taken. I loved it, but then again it's pretty interesting when this sort of stuff is just bubbling up out of the Earth!