Murphys Old Timers Museum

Mercer Caverns is a show cave located 1 mi north of Murphys. It is named after the gold prospector Walter J. Mercer who discovered the caves around 1885 and filed a claim. The caverns have a large number of speleothems, stalactites, and stalagmites. It is formed in a marble unit known as the Calaveras Formation. It also contains a large display of aragonite frostwork. Tours last about 45 minutes, covering a total distance of approximately 0.25 mi and descending to a depth of 161 ft below the surface. There are 208 steps while descending into the cavern and 232 steps while ascending, the equivalent of a 16-story building. The cave remains a constant temperature of 55 F; visitors should wear a light jacket and comfortable walking shoes. There is also a visitor center and store on site.