Malbog Hot Spring
The Malbog Hotsprings are volcanic in origin, and hydrogen sulphide is a
common gas where sulphur and heat are present.  The waters have been
known for their healing properties since the early 1900's. They are
located just outside of the town of Buena Vista on the road to Torrijos.  

Getting to the springs themselves is part of the adventure as the road
leading to the springs' entrance is not paved, and at you will have to
cross a small stream.
Above: Present Day
Below:  As seen in 1902 by the U.S. Army