Have you ever bathed in a mineral-rich water pool set right on the mountainside and overlooked by other blue mountain slopes? Such an amazing infinity pool is found among Oaxaca's rock formations, along with plenty of numerous springs. The very name Hierve el Agua literally means "the water boils."
Besides the springs, you'll also find another spectacular natural attraction—a seemingly frozen waterfall. Its water looks still owing to numerous salt crystals that form in the flow, similar to the famous 'cotton castle' in Pamukkale, Turkey.
As to the season, the most convenient time to set off to the mountains is the dry months—namely November to April.