Minnetonka Cave 
1405 Hollipark Dr.
Idaho Falls, ID 83401
435-245-4422
https://www.fs.usda.gov/recarea/ctnf/recarea/?recid=70736
Natural Area: Birding, Camp, Caving, Fish, Hike, Picnic, Walk, Water Sports
Minnetonka Cave, in beautiful St. Charles Canyon northwest of Bear Lake, offers a half-mile of fascinating stalactites, stalagmites, and banded travertine in nine rooms. From mid-June until Labor Day, over 20,000 people visit the Cave and take the guided tours. The cave stays a brisk 40 degrees all year so bring your jacket! Minnetonka is one of two caverns administered by the Forest Service. Within St. Charles Canyon are campgrounds and a large group use areas with fishing and hiking nearby. Keep an eye out of resident wildlife such as moose and deer.