Craters of the Moon National Monument protects the largest basaltic lava field in the lower 48 states. The monument is filled with hundreds of unique volcanic formations, including lava tunnels, cinder cones, and ice caves, created by the heat and eruptions of the Great Rift.

The Frank Church River of No Return Wilderness encompassing some two and a quarter million acres of immense canyons and forested mountains in central Idaho, including some of the most spectacularly remote and beautiful area in the country.

Hells Canyon National Recreation Area contains the deepest river gorge in North America, along with over 650,000 acres of adjacent land. Scenic vistas that rival any on the continent can be found here, as well as world-class whitewater rafting, vast reaches of remote wilderness for hikers or horseback riders, and diverse and abundant wildlife.

The Sawtooth National Recreation Area consists of over 750,000 acres of protected land filled with jagged mountain ranges and wild river headwaters.

Yellowstone National Park, a region once rumored to be "the place where hell bubbles up", is one of the Earth's greatest natural wonders, a mountainous land parked atop one of the world's largest active volcanoes. Yellowstone is best known for its bubbling calderas and other geothermal wonders, peculiarly framed by thickly forested mountains and high alpine lakes.