Yosemite Miror Pond
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Yosemite National Park
#1 on Explore
The well named "Miror Pond", Yosemite Valley.
For this one, I had to remove my shoes and go in the pond. The water was so cold (4 or 5° C), that, after having spent 15 minutes taking pictures, when I came back to the ground, my feet were almost blue, and completly insensitive!