California Point of Historical Interest #4. The Showplace of the Sierra since 1885. Mercer Caverns, world famous for the rare Aragonite flos ferri, celebrated its one hundredth year of discovery and operation on September 1, 1985. It is the longest continually operating commercial caverns in the state of California.
Follow the signs from downtown Murphys. Summer hours: Daily, 10 a.m. to 8:30 p.m., Memorial Day through September 30. Winter hours: October through May, Sunday through Thursday, 10 a.m. to 4:30 p.m.; Friday and Saturday, 10 a.m. to 7:30 p.m.
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