Plank Road: Located in the Imperial Sand Dunes Recreation Area, off Grays Well Road, is a small surviving remnant of the unique "floating" wooden road. The first Plank Road was constructed across the dunes in 1915. The second Plank Road (shown above) built in 1916, was used for ten years until it was replaced by a more reliable paved highway in 1926.
Sacatone Overlook: This McCain Valley Road spur extends east 1.5 miles to Sacatone Spring, from which Carrizo Gorge may be viewed. Several wooden trestles of the now abandoned Arizona-San Diego Railroad can be seen from the overlook.
San Sebastian Marsh: This unique, water-based habitat along San Felipe Creek has supplied a permanent, dependable source of water for people and wildlife since ancient times. The marsh was a stopping place for the Spanish explorer Anza, who named it after his Indian guide Sebastian Tarabel.
Sawtooth Mountains Wilderness: Ridges and valleys alternate here rising from 1,400 to 5,600 feet. The ridges extend like fingers from the Laguna Mountains into the desert, creating the alluvial valleys of Vallecito, Inner Pasture and Canebrake Canyon.
Table Mountain: North of Interstate 8, Table Mountain offers views of the In-Ko-Pah Mountains and Jacumba Mountain. Table Mountain provides numerous opportunities for recreation.
Tumco: Originally called Hedges, this town was renamed Tumco in 1910 for the The United Mines Company. With a peak population of over 3,000, it boasted the largest stamp mill in the country with 100 stamps, capable of crushing 167 tons of ore per day. When the richest ore deposits were depleted in 1914, the mines closed.
Valley of the Moon: Within the Jacumba Mountains Wilderness, this landscape features granite boulders jumbled in fantastic piles and towers that conceal mazes of passageways and caves.
Wiley Well District: Best known for its many geode beds and a variety of other rocks and minerals, the Wiley Well District has been popular with rockhounds since the 1940s. There are several productive geode beds in the Black Hills, including Hauser, Roads End, Potato Patch, Cinnamon, Straw, and Hidden Saddle Beds.
Yuha Basin: The Yuha Basin is rich in both human and natural history. The area contains several unique attractions; the Juan Bautista de Anza National Historic Trail, geoglyphs created by Native Americans, an area of rare crucifixion thorns, oyster shell beds, and the Yuha Well.
Yuha Geoglyph: Constructed by Native Americans, a geoglyph is a large symbol etched into the ground by clearing lines dark rock (desert pavement) to expose the lighter soil underneath.
Yuha Well: The Yuha Well became an important oasis for later travelers and settlers following the Anza Trail through the desert. Led by Indian guides, Captain Juan Bautista de Anza was the first Spanish explorer to visit the Yuha.