The isolated picture thread.

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So many amazing photos in this thread. And many, like this one, that leave me wanting to know more. Where is this? What is flowing down over the building? The green a copper base? The red an iron? Or? So many questions, and no leads...

It's a great deal more work to add the detail of every picture....

...the one above....

The walls of the Puente del Inca natural rock bridge in Argentina feature bright orange and yellow bacteria mats created by natural sulfur springs.
 
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