2010-11-2 2002-8-8 The Civil Defense caves are lava tubes in the deseret area north of Rexburg and the St Anthony Sand Dunes, Idaho. The cave are large and easy to walk through. 94671 text/html 1.0 EN Civil Defense Caves Lava Tubes Civil Defense Caves, north of Rexburg, Idaho text EZ-NetTools EZ-NetTools specializes in providing professional custom web site design and ecommerce services that you can easily maintain.