Gabrielino Trail

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.

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).

KCBS-TV/FM Tower (formerly the KNXT/KNX-FM Tower) is a 296.4 meter (972 ft) high guyed radio/television tower on Mount Wilson above Los Angeles (near the Mount Wilson Observatory) at 123 CBS Lane. The KCBS-TV/FM Tower was built in 1986. It was owned by CBS Corporation and used by KCBS-TV (Channel 2) and KCBS-FM (93.1 MHz, 27,500 watts). When the DTV conversion was planned the CBS transmitters (both of them) were installed in the Channel 9 building and combined onto one antenna. The guyed tower facility, the westernmost on Mount Wilson, was sold in November 2009 to Richland Towers whose headquarters is in Tampa, Florida. However, as part of the spectrum auction repack, KCBS-TV moved back to the tower.

KDOC-TV (channel 56) is a religious television station licensed to Anaheim, California, United States, serving the Los Angeles area as an owned-and-operated station of Tri-State Christian Television (TCT). The station maintains studios on East First Street in Santa Ana, and its transmitter is located atop Mount Wilson.

KPCC (89.3 FM) – branded LAist 89.3 – is a non-commercial educational radio station licensed to Pasadena, California, primarily serving Greater Los Angeles and the San Fernando Valley. KPCC also reaches much of Santa Barbara, Ventura County, Palm Springs and the Coachella Valley, and extends throughout Southern California with five low-power broadcast relay stations and three full-power repeaters. Owned by Pasadena City College and operated by the American Public Media Group via Southern California Public Radio, KPCC broadcasts a mix of public radio and news, and is an owned-and-operated station for American Public Media; in addition to serving as an affiliate for NPR and Public Radio Exchange; and is the radio home for Sandra Tsing Loh and Larry Mantle. Besides a standard analog transmission, KPCC broadcasts over two HD Radio channels, and is available online. The studios are located in Pasadena, while the station transmitter is on Mount Wilson. It is one of two full NPR members in the Los Angeles area; Santa Monica-based KCRW is the other.

KTLA (channel 5) is a television station in Los Angeles, California, United States, serving as the West Coast flagship of The CW Television Network. It is the largest directly owned property of the network's majority owner, Nexstar Media Group, and is the second-largest operated property after WPIX in New York City. KTLA's studios are located at the Sunset Bronson Studios on Sunset Boulevard in Hollywood, and its transmitter is located atop Mount Wilson. KTLA was the first commercially licensed television station in the western United States, having begun operations in January 1947. Although not as widespread in national carriage as its Chicago sister station WGN-TV, KTLA is available as a superstation via DirecTV and Dish Network (the latter service available only to grandfathered subscribers that had purchased its a la carte superstation tier before Dish halted sales of the package to new subscribers in September 2013), as well as on cable providers in select cities within the southwestern United States and throughout Canada. As of 2015, KTLA operates an internet-only news radio channel on iHeartRadio.

KLLI (93.9 MHz, "Cali 93.9") is an FM radio station in Los Angeles, California. Owned by the Meruelo Group, it broadcasts a bilingual Latin pop/rhythmic contemporary format. The station has studios located in Burbank, while its transmitter is based on Mount Wilson, and broadcasts in the HD Radio format.

KLOS (95.5 FM, "95-5 KLOS") is a commercial radio station that is licensed to Los Angeles, California, and serves the Greater Los Angeles area. The station is owned by Meruelo Media. KLOS airs a mainstream rock radio format and has broadcast rock music in some form since 1969. The studios are on West Olive Avenue in Burbank. The transmitter is atop Mount Wilson. The station is rebroadcast on FM translator K255BZ in China Lake, California. KLOS broadcasts using HD Radio technology. The KLOS morning drive time show, Heidi & Frank, is featured on the nationally syndicated television program Dish Nation and is rebroadcast around the clock on KLOS-HD2. The HD3 digital subchannel carries SoCal Armenian which plays Armenian music.

KBIG (104.3 FM, 104.3 MYfm) is a commercial radio station that is licensed to Los Angeles, California and serves the Greater Los Angeles area. The station is owned by iHeartMedia and broadcasts a hot adult contemporary format heavy on music from the 1990s to the present day. KBIG has studios located in Burbank, California and its primary transmitter is based on Mount Wilson.

KABC-TV (channel 7) is a television station in Los Angeles, California, United States, serving as the West Coast flagship of the ABC network. Owned and operated by the network's ABC Owned Television Stations division, the station maintains studios in the Grand Central Business Centre of Glendale, and its transmitter is located on Mount Wilson.

KRCA (channel 62) is a television station licensed to Riverside, California, United States, broadcasting the Spanish-language Estrella TV network to the Los Angeles area. It is the flagship television property of Burbank-based Estrella Media. The station's studios are located on North Victory Drive (near Interstate 5) in Burbank. Through a channel sharing agreement with KABC-TV (channel 7), KRCA transmits using KABC-TV's spectrum from an antenna atop Mount Wilson. Despite Riverside being KRCA's city of license, the station maintains no physical presence there.