▁E cho ▁Ca ver ns , ▁Pennsylvania ▁ ▁Indian ▁Jim ' s ▁C ave , ▁Virginia ▁ ▁Indiana ▁Ca ver ns , ▁Indiana ▁ ▁In fer nal ▁Ca ver ns , ▁California ▁ ▁Inner ▁Space ▁Ca ver ns , ▁Texas ▁ ▁Jacob s ▁Ca vern , ▁Missouri ▁ ▁Jacob ' s ▁Well , ▁Texas ▁ ▁Jew el ▁C ave , ▁South ▁Dak ota ▁ ▁K art ch ner ▁Ca ver ns , ▁Arizona ▁ ▁Kaz um ura ▁C ave , ▁Hawai i ▁ ▁Key ▁C ave ▁National ▁Wild life ▁Ref uge , ▁Alabama ▁ ▁K ick ap oo ▁Ca vern ▁State ▁Park , ▁Texas ▁ ▁King ▁Phill ip ' s ▁C ave , ▁Massachusetts ▁ ▁King ston ▁Salt p eter ▁C ave , ▁Georgia ▁ ▁K una ▁C aves , ▁Id aho ▁ ▁Lake ▁Sh asta ▁Ca ver ns , ▁California ▁ ▁La ure l ▁Ca ver ns , ▁Pennsylvania ▁ ▁L ava ▁B eds ▁National ▁Monument , ▁California ▁ ▁L ava ▁River ▁C ave , ▁Arizona ▁ ▁L ava ▁River ▁C ave , ▁Oregon ▁ ▁Le ch ug u illa ▁C ave , ▁New ▁Mexico ▁ ▁Le h man ▁C aves , ▁Nev ada ▁ ▁Leon ▁S inks ▁Ge ological ▁Area , ▁Florida ▁ ▁Lewis ▁and ▁Clark ▁Ca ver ns , ▁Mont ana ▁ ▁Lin ville ▁Ca ver ns , ▁North ▁Carolina ▁ ▁Lock port ▁C ave , ▁New ▁York ▁ ▁Log an ▁C ave ▁National ▁Wild life ▁Ref uge , ▁Ark ansas ▁ ▁Look out ▁Mountain ▁Ca ver ns , ▁Tennessee