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9 wondrous water caves

By: Catie Leary on March 14, 2011, 12:20 p.m.
Sea Lion Cave

Photo: Paul Hamilton/flickr

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Sea Lion Cave

Oregon's Sea Lion Cave is not only famous for being the largest sea cave in the world, but also for the plethora of barking wild sea lions that lounge on its craggy rocks.

Located just a few miles from Florence, this enormous basaltic cave is situated 300 feet beneath Highway 101. To reach the inner caverns, visitors must take an equally deep elevator and then proceed down some stairways and trails.