The exhilarating Sumaging Cave, or Big Cave, is the most popular of Sagada's caves, its immense chambers home to otherworldly rock formations with such fanciful names as 'the King's Curtain' and the more literal 'the Cauliflower'. You’ll need a guide (P500) to tour the cave (roughly two hours); the guide will provide a gas lantern. It’s quite slippery in parts and you’ll get wet; wear river sandals or other shoes with nonslip soles. It's a 45-minute walk south of Sagada.