In 1880 a sea captain named Cox rowed a small skiff into a fissure in a 300-foot-high sea cliff. Inside, he was startled to discover a vaulted chamber in the rock, 125 feet high and 2 acres in size. Hundreds of massive sea lions—the largest bulls weighing 2,000 pounds or more—covered every available surface. Cox's discovery would become one of the Oregon Coast's premier attractions, if something of a tourist trap. An elevator near the cliff-top ticket office descends to the floor of the cavern, near sea level, where vast numbers of Steller's and California sea lions relax on rocks and swim about (their cute, fuzzy pups can be viewed from behind a wire fence). This is the only known hauling-out area and rookery for wild sea lions on the mainland in the Lower 48, and it's an awesome sight and sound. In spring and summer the mammals usually stay on the rocky ledges outside the cave; in fall and winter they move inside. You'll also see several species of seabirds here, including migratory pigeon guillemots, cormorants, and three varieties of gulls. Gray whales are visible during their northern and southern migrations, October–December and March–May. The gift shop has tasty fudge—try the jalapeño.