Top 5 Caves 콘트라 코스타 카운티

The Wind Caves are part of an area called Rock City in the Mount Diablo State Park. The Wind Caves are unique sandstone caves and tunnels that were formed by wind erosion over time. The caves vary in size, providing opportunities for hikers to wander through and appreciate the sculpted rock.

This once 150-foot-deep air shaft was put in place to ventilate a coal mine to keep it free from dangerous gasses. There is a short tunnel to access the interior and get a closer look. On the excavation sides, there is still evidence of marks left by the picks from miners.

The origin of this unusual little underground dwelling is unknown. You can see a round stovepipe hole, a square skylight, and a shelf opening from the interior.

This well-maintained trail offers fantastic views of the San Francisco Bay, Mount Diablo, the Livermore Valley and the Sacramento River Delta. In the spring, many wildflowers bloom on the green hillsides, with lupine and golden poppies blooming as late as October. Any time of year is beautiful here, encouraging you to take a break from the steep climb and take a few gorgeous photos.

This once 150 feet deep air shaft was put in place to ventilate a coal mine to keep it free from dangerous gasses. There is a short tunnel to access the interior and get a closer look. On the excavation sides, there is still evidence of marks left by the picks from miners.

This unusual little underground dwelling's origin is unknown. From the interior, you can see a round stovepipe hole, a square skylight and a shelf opening.

Devil's Hole trail leads along the southern edge of the Las Trampas Regional Wilderness, which offers 5,342 acres of wilderness and an expanded trail system. It passes by Devil's hole, a cave formed by a folded rock formation where the softer stratas have eroded to form a tunnel-shaped cave with openings on both sides of a 100 m long crawlspace. http://www.ebparks.org/parks/las_trampas For more hiking details see http://bahiker.com/eastbayhikes/lastrampas.html or the other sections of this loop here: https://www.komoot.com/tour/7109119

Water, wind, and calcite erosion in per-volcanic sandstone formation. Slightly acidic rainwater seeps into the sandstone during winter rains and dissolves some of the calcite. Warm and dry days cause the moisture to pull the dissolved calcium back out of the rock, causing holes and caves to form. Watch for peregrine falcons and other birds of prey nesting high up in the Castle Rock caves. The upper trails are closed Feb-July to avoid disturbing the nesting birds.