Photo by christaki.

Flickr user christaki took this vibrant and autumnal photo on the Ridge Loop Trail in the Bull Run Mountains Natural Area Preserve. The leaves blanketing the ground, the tree trunk laying across the stream, the sun bouncing off the glassy water but giving no warmth—it all says one thing: Winter is coming. But even when it’s cold out, it can be this beautiful. So what are you doing on the Internet right now? It’s a nice, if brisk, Saturday in Washington. Enjoy.