That first picture of me is in Fern Canyon. It runs up from the beach and gets filled with fog every night. it is about 30-50 across and the walls are about 30 feet high. They are covered from top to bottom with several kinds of ferns.
It was a very remarkable place.
I found a link to some other pictures of it and the Redwood national forest.

Gosh I need to get back up there.
Redwood National Forest