No grey days here

Even if the sun doesn't shine, the colors of leaves give brilliance to grey days.

Here I've stopped on the Parkway to see what this sign is talking about...

It's Looking Glass Rock...the huge bluff above me.  Here the sign talks about how it was created, as well as how various people have used it.  And the cliff is actually a Pluton, a geological feature.  The name came from how the sheer face shines when there's water on it, becoming a huge "looking glass."