At Hierve El Agua, 13km southeast of Mitla, bubbling mineral springs run into bathing pools with a dramatic cliff-top location and expansive panoramas. Hierve El Agua means ‘the Water Boils,’ but the mineral-laden water is actually cool to cold. Water dribbling over the cliff edge for millennia has created mineral formations that look like huge frozen waterfalls. Altogether the pools here make for a unique bathing experience.