'But, where does all the water go?'

That's the question on many people's minds this week when a lake situated in Oregon's Willamette National Forest underwent it's annual disappearing act by gradually draining into a lava tube. Lost Lake, as it's fittingly known, fills up in the winter when the melting snow exceeds the drainage rate, and then drains once more come spring.

According to the U.S. Geological Survey, "lava tubes are natural conduits through which lava travels beneath the surface of a lava flow. Tubes form by the crusting over of lava channels and pahoehoe flows."