Kuna Caves are lava tubes found south of Kuna, Idaho. There is currently one publicly known entrance to the cave, an opening in the ground with a caged ladder leading down into the cave.
Wikipedia https://en.wikipedia.org/wiki/Kuna_Caves
Address W Dickman Rd, 83634, United States
Coordinates 43°24'43.645" N -116°26'58.935" E