Big Bend National Park is full of surprises and this is one of them. In the far southeast corner of the park, a geothermal spring bubbles up from the bottom of the Rio Grande River. A relic of the area’s ancient volcanic past, it is crystal clear, laden with healthy minerals and is a constant 105 degrees – about the same temp as a hot tub. In 1909, an entrepeneur named J.O. Langford built a bathhouse to corral the springs and opened a health resort. Besides the bath house, it had a store, a cafe, a post office and cabins that rented for $1.25 a night. People came from all over the world to soak in its healing waters and there are all kinds of stories of people being made well from just about everything. In 1916, Langford had to abandon his operation because of the Pancho Villa raids. After 10 years of border violence, Langford returned in 1927 and started over, making things bigger and better. He sold the operation to the state of Texas in 1942, which donated it to the National Park Service. The NPS ran the resort as a concession until 1952, when it was abandoned for good. However, the springs and the foundation of the bath house are still open to the public. You can soak in it all you want (although you can’t do it naked like the old days). If you get hot, you can hop into the Rio Grande to cool off, then climb back in. It is the most popular destination in the park. In addition to the springs, you can explore the ruins of the old resort facilities. There’s also a geocache there, so how could we resist? The yellow arrow points to the spring. The water in the enclosure is all spring water. It flows into the river over the outside wall.