When I was discovering the "Earth from Above" pictures, I was bedeviled by the image below. I thought it was Mammoth Hot Springs in Yellowstone NP, and it wasn't labeled. It took a bit of searching to find out where it was -- and I was surprised to also find out I'd never heard of it before. The image is of Pamukkale, a famous site in Turkey that features active, large travertine terraces. Apparently they aren't as hot as Mammoth, because people can clearly wade and immerse in them. Below are some additional images and links about Pamukkale. Pamukkale, a...