A Guide to Historic, Backcountry & Scenic Drives Across the Gem State. With 31 scenic byways in Idaho—plus North America’s sole multinational scenic route—exploring the Gem State is about the journey and the destination. Scenic byways crisscross the state, meaning you’ll likely experience at least one scenic route while exploring Idaho. Enjoy winding through charming communities, visiting state parks and digging into local cuisine. Add a byway (or a few!) to your trip plans so you can discover all that Idaho has to offer.