Just under an hour outside of Austin lies Hill Country’s largest continually flowing karstic spring, which also happens to be the state’s most dangerous diving spot. Jacob’s Well, just north of the town of Wimberley, is the greatest source of water for the Edwards Aquifer, which is home to numerous unique and endangered species and also provides water and resources for the many neighboring towns and cities. It has also become a popular swimming destination in recent years, due to its refreshing natural spring water and surrounding rocks from which to dive into the cool depths of the well. Just don’t try to explore it. The murky depths of the well have long intrigued divers, but the narrow caverns that extend for up to 4,300 feet (!!!) in one spot, can be difficult and extremely dangerous to navigate, even for the most experienced divers. But for the adventurous, it’s a great spot to unleash the kid in you and jump of off rocks, splash around in the water, and cool off under the hot Texas sun. If you go, be sure to stop by the nearby town of Wimberley as well to check out its adorable shops and awesome antiques.