NASA's Earth Observatory featured a lake in Antarctica that is quite remarkable.
It's called Lake Unter-See. According to the article,
"Hidden below the ice is one of the lake's most remarkable features: large, conical microbialite structures spread across the lake's floor. The structures, formed by photosynthetic microbes that trap and bind sediment, were first discovered by geobiologist Dale Andersen and colleagues in 2008. The formations are thought to be modern, living examples similar to some of Earth's oldest fossils—stromatolites found in places such as southwestern Greenland and Western Australia. They offer a glimpse back to a time more than 3 billion years ago, when microbes were the only form of life on Earth."Below the picture from space is a picture of the microbial structures on the bottom.
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