Built during World War II, this bunker defends the mouth of the Columbia River. It was never attacked, but over the years nature has inflicted its own kind of wear on the cement structure. The walls leech chemicals, and tiny ferns are beginning to grow in cracks and crevices. A canopy of heavy vegetation descends from above, threatening to envelope it all. It won’t, however. It is part of Cape Disappointment State Park, and is maintained in a permanent state of “arrested decay.”