The hook
Northern California's largest coal mining district ran in these hills above Antioch — five vanished towns, a hilltop pioneer cemetery, and a sand mine you can walk 950 feet into on a lantern-lit tour.
01Why it's worth it
Hardly anyone in the Bay Area knows the East Bay had coal country, but from the 1860s these hills produced more than four million tons, supporting five towns — Nortonville, Somersville, and three others — that then disappeared so completely only the Rose Hill Cemetery remains, an 1860s hilltop burial ground of miners and their families with a real melancholy to it. Later the same hills were mined for silica sand to make glass, and that's the visitor payoff: the Hazel-Atlas Mine tour walks you 950 feet underground through ore chutes, the mine boss's office, and exposed geology, while the visitor center itself sits in a room the sand miners carved. Above ground, 6,000 acres of oak-grassland trails lace the old town sites and mine openings. It's a whole industrial ghost-landscape an hour from San Francisco that almost nobody visits.
02How to experience it
Somersville Rd south from Antioch (parking fee). Do the Hazel-Atlas underground tour (90 min, weekends March–November, small fee, ages 7+, sign up at the Greathouse Visitor Center), then walk up to Rose Hill Cemetery and the Nortonville townsite. Spring green or fall light are the seasons; summer bakes.