The Top 10 Caves in the Coast Range

The Bear Gulch Cave has two sections, with the lower section usually open for about 10 months of the year, and the upper section closed most of the time to … read more

Nice hike, especially when it's hot, this part is a little more shadowed. Flashlight strongly recommended. May be seasonally closed, see Park's website in advance.

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 … read more

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 … read more

This is one of the easiest waterfalls to visit, particularly considering it's located near the rugged Sespe Wilderness. "Easy" being a relative term depending on how far you traveled to … read more

The Oregon Caves Visitor Center is open from spring through fall. It offers cave tour ticket sales, information, exhibits on the Oregon Caves and Siskiyou Mountains, Junior Ranger programs, and … read more

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 … read more

Named for its impressive group of three closely situated monoliths, two land-based and one rising from the sea, this state park features a short trail leading to the beach with … read more

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 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.