Stony Ridge Observatory

The Silver Moccasin Trail is a 53-mile (85 km) trail located in the San Gabriel Mountains, northeast of Los Angeles. It begins at Chantry Flat Recreation Area above the city of Arcadia, California, traversing upward and down through several canyons and along the high ridges of the Angeles National Forest. This trail connects Mt. Baden-Powell, Mount Burnham, Throop Peak and Mount Hawkins. It comes to its highest point of 9,399 feet (2,865 m) at Mount Baden-Powell after which point it descends to its terminus at Vincent Gap on the Angeles Crest Highway near Wrightwood.

The Old Short Cut or Old Short Cut Cabin or Old Short Cut Ranger Station or the West Fork Ranger Station is California's first ranger station, built in 1900. The Old Short Cut Cabin was designated a California Historic Landmark (No.632) on March 3, 1958. The Short Cut Cabin is located is in what is now the Angeles National Forest in the San Gabriel Mountains of Los Angeles County. The name Old Short Cut Cabin comes from Short Cut Canyon Trail, the cabin was a popular stopping spot on the trail. The Old Short Cut Cabin was built by forest service men Louie Newcomb and Phillip Begue. At the time of construction in 1900, the forest was called the Gabriel Timberland Reserve. In 1907 the forest was renamed the San Gabriel National Forest. In 1908 it was renamed again to its current name to Angeles National Forest. The San Gabriel Forest Reserve was established on December 20, 1892. The Old Short Cut Cabin was constructed where Shortcut Canyon joins the West Fork of the San Gabriel River Canyon. The Cabin was restored and move to the United States Forest Service's Chilao Visitor Center in the 1980s just off Angeles Crest Highway.

Newcomb's Ranch is a roadhouse at 5,340 feet (1,630 m) in elevation in the Angeles National Forest, near Los Angeles, California. It is the only private property along the Angeles Crest Highway and is very popular with motorcyclists and is called "the informal headquarters for riders" by the Los Angeles Magazine and "one of Southern California's most famous Rickey Racer Roadhouses" by Motorcyclist. The roadhouse is located in unincorporated Los Angeles County, near La Cañada Flintridge.The Newcomb family, who also created the Mount Waterman ski area, settled the property using the Land Revision Act of 1891, building the roadhouse in 1939. The roadhouse has served as a restaurant, hotel, general store, gas station, and as a brothel or love hotel. The inn burned in 1976, allegedly started by a cook who had been terminated. The fire destroyed most of the second floor, which was not rebuilt. It was purchased in late 2001 by Frederick Rundall, an oncologist who purchased the roadhouse from Lynn Newcomb and remodeled it in 2003 for $340,000. The second floor became lodging for employees.Motorcyclist and comedian Jay Leno is a "frequent visitor" to Newcomb's.The roadhouse closed in 2009 for the Station Fire. In January 2010 following the storm closure of Angeles Crest Highway between Newcomb's and Los Angeles, as well as a South Coast Air Quality Management District violation for operating a diesel generator without permit, Rundall shelved remodeling plans and discussed closing down completely.The ranch was closed in March 2020 and put up for sale in June 2021. As of January 2023, the ranch is still closed and up for sale.

Vetter Mountain is located in the San Gabriel Mountains and within the Angeles National Forest, Los Angeles County, California, United States. Elevation 5,911 feet (1,802 m) feet. Named by USFS surveyor Don McLain (c. 1933) for Victor P. Vetter (nd.), a dedicated forest ranger and fire dispatcher. Vetter won the USFS Bissell Medal for outstanding work in forest conservation (1930). The Silver Moccasin Trail crosses the mountain on its eastern slopes.

Horse Flats is a region of the San Gabriel Mountains in the Angeles National Forest north of Los Angeles. It is known for its US Forest Service campground (open April 1-November 15) and for the excellent granite bouldering near the campground. It is off California State Route 2. The elevation is 5,800 ft (1,800 m). Closed in the winter months. In the campground is Mount Hillyer Trail, which connects to the Silver Moccasin Trail.

The San Gabriel Wilderness is a wilderness area created in 1968 of more than 36,118 acres (150 km2) within the Angeles National Forest and San Gabriel Mountains National Monument. The area lies on the southern slopes of the San Gabriel Mountains, between the Angeles Crest and the West Fork of the San Gabriel River.The area was originally set aside as the Devils Canyon-Bear Canyon Primitive Area of 35,000 acres (140 km2).The San Gabriel Mountains were first preserved by the federal government in 1892 as the San Gabriel Timberland Reserve, established by U.S. President Benjamin Harrison and influenced by California conservationists, Abbot Kinney and John Muir. This forest reserve would later become part of the Angeles National Forest in which the San Gabriel Wilderness is now located.

The Gabrielino Trail is a United States National Recreation Trail that runs through the Angeles National Forest. Its western trailhead is at Windsor Avenue in Altadena, California, and it runs generally east/west, with its eastern end at Chantry Flat, just north of Arcadia, California. It passes through three major watersheds and has an elevation gain/loss of 3,500 ft (1,100 m).

Cogswell Dam is a rockfill dam on the West Fork of the San Gabriel River in Los Angeles County, California. It is located in the San Gabriel Mountains, northeast of Mount Wilson, and within the Angeles National Forest. It forms Cogswell Reservoir, which has a capacity of 8,969 acre-feet (11,063,000 m3).The dam serves mainly for flood control in conjunction with San Gabriel Dam and Morris Dam downstream. San Gabriel Dam lies 13 miles (21 km) downstream.

Alder Creek is an approximately 4.25-mile (6.84 km) long tributary of Big Tujunga Creek in Los Angeles County, California and the Angeles National Forest. It is formed by the confluence of the West Fork and North Fork Alder Creek in the San Gabriel Mountains a short distance south of Pacifico Mountain. It then flows south, picking up the Middle Fork, East Fork and Mule Fork before emptying into Big Tujunga Creek 5 miles (8.0 km) east of Hidden Springs. Near its mouth the creek flows under a bridge carrying Upper Big Tujunga Canyon Road.

Monrovia Peak is a 5,412-foot-elevation (1,650 meter) mountain summit located in the San Gabriel Mountains, in Los Angeles County, California, United States.

The Mount Wilson Observatory (MWO) is an astronomical observatory in Los Angeles County, California, United States. The MWO is located on Mount Wilson, a 5,710-foot (1,740-meter) peak in the San Gabriel Mountains near Pasadena, northeast of Los Angeles. The observatory contains two historically important telescopes: the 100-inch (2.5 m) Hooker telescope, which was the largest aperture telescope in the world from its completion in 1917 to 1949, and the 60-inch telescope which was the largest operational telescope in the world when it was completed in 1908. It also contains the Snow solar telescope completed in 1905, the 60 foot (18 m) solar tower completed in 1908, the 150 foot (46 m) solar tower completed in 1912, and the CHARA array, built by Georgia State University, which became fully operational in 2004 and was the largest optical interferometer in the world at its completion. Due to the inversion layer that traps warm air and smog over Los Angeles, Mount Wilson has steadier air than any other location in North America, making it ideal for astronomy and in particular for interferometry. The increasing light pollution due to the growth of greater Los Angeles has limited the ability of the observatory to engage in deep space astronomy, but it remains a productive center, with the CHARA array continuing important stellar research. The initial efforts to mount a telescope to Mount Wilson occurred in the 1880s by one of the founders of University of Southern California, Edward Falles Spence, but he died without finishing the funding effort. The observatory was conceived and founded by George Ellery Hale, who had previously built the 1 meter telescope at the Yerkes Observatory, then the world's largest telescope. The Mount Wilson Solar Observatory was first funded by the Carnegie Institution of Washington in 1904, leasing the land from the owners of the Mount Wilson Hotel in 1904. Among the conditions of the lease was that it allow public access.

The CHARA (Center for High Angular Resolution Astronomy) array is an optical interferometer, located on Mount Wilson, California. The array consists of six 1-metre (40 in) telescopes operating as an astronomical interferometer. Construction was completed in 2003. CHARA is owned by Georgia State University (GSU).