Simply named The Grotto, this narrow bolder-filled canyon with small talus caves covering a creek in the mountains makes a fun destination for a short hike. From the Circle X Ranch Visitor Center in the Santa Monica Mountains National Recreation Area on the west side of Malibu, it is 3-mile round trip to the Grotto with 475 feet of elevation loss. The trail beneath Circle X Ranch and Exchange Peak From the main parking area for Circle X Ranch, walk down the access road to a small group campsite and pick up the single track trail to the Grotto, which descends into a verdant canyon. ...Read more.