The most striking day trip from Kingman takes you underground. Grand Canyon Caverns lie about 100 kilometres east on Historic Route 66 — a dry limestone cave system that descends 65 metres by lift, with no dripping water, no formations, and an eerie, bone-dry stillness that preserves everything left inside. The above-ground stop includes a diner, motel, and gift shop along the longest unbroken stretch of original Route 66 anywhere.