First, a report about a delightful kayak trip around Chuckanut Bay, south of Bellingham.
They came upon most unusual rocks - that had weathered like honeycomb. The rock was marked by golf ball-sized cavities. They are called trafone (singular) or trafoni. Chuckanut has trafoni large enough to crawl inside.
Learn more about trafoni in the same area at NW Geology.
Also look at the beautiful photo gallery of tafoni around the world at Tafoni.com.