Crack in the Ground is a stunning geological feature within Four Craters Lava Bed Wilderness Study Area. The volcanic fissure is two miles long and up to 70 feet deep. You can take a hike into this gorge. Keep an eye on the weather, though, and avoid it during rain since it might get flooded in a rain storm.
It is just a short detour if you take the Christmas Valley alternate of the Oregon Desert Trail.