5175 Somersville Rd
Antioch, California 94509

Explore the underground through a guided tour and learn its history, geology, and the methods used to mine the sandstone. Advance tours of one and one-half hours by reservation are offered at 11am, 1pm, and 2pm, March 14th through November (weekends only). A 10 am tour is available to groups of 10 or more. First come/first served tours are offered at noon and 3 pm only. Must be at least 7 years old, parent participation required. Parking fee may be charged. This program is not wheelchair accessible. The 10am tour is not available for online registration. Reg. Required: 1-888-EBPARKS (1-888-327-2757), option 2.

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