This 400' aerial view overlooks Forest Route 49 passing across the Giant Crater lava tube system south of Medicine Lake, California.  Giant Crater is nearly ten miles to the north & this lava tube system can be traced aerially for nearly 18 miles.  It contains plenty of collapse breakdown pits, cave entrances, bridges, & ice caves.  Features like this are also found on the moon.  The lava flow is grown over by vegetation, but is less wooded compared to higher elevated hillsides.