Walter D. Valentine Cottage B

Sahag-Mesrob Armenian Christian School (SMACS) is a private Armenian Christian school currently located in Pasadena, California, after the school’s campus in Altadena, California was destroyed in 2025. Founded in 1980, it provides a Christ-centered education with a focus on Armenian cultural heritage for students from preschool to eighth grade.

Bulgarini Vino Cucina, previously (and still commonly) known as Bulgarini Gelato Artigianale, is a restaurant specializing in Italian cuisine. Originally established as an ice cream parlor specializing in gelato, it is located at 749 East Altadena Drive in Altadena, California, beside The Bunny Museum.

Keyes Bungalow is a National Register of Historic Places structure in Altadena, California. It is also notable as being the home of Jackson Gregory an author of Westerns in the 1920s and 1930s. It remains a private home.The Keyes Bungalow's architecture is also known as "airplane" style for its wide, shallow roofline that resembles airplane wings. It was placed on the Register in 1978 for its significance as an example of a Craftsman style home.

Gen. Charles S. Farnsworth County Park, also known as Farnsworth Park, is a Los Angeles County park and National Register of Historic Places district (site #97000027) in Altadena, California. The land was purchased by Los Angeles County in 1921 for use as a nursery. When the County built new nurseries in the 1930s, a movement to turn the land into a county park was spearheaded by General Charles S. Farnsworth and William O. Davies. Farnsworth designed the park and supervised its grading and landscaping. Davies began planning for a community center. Funds for the construction of the community center came from grants from the Public Works Administration. The park was completed in 1934. The park was originally named Altadena Park. The park project included a two-story arts and crafts American craftsman style building that was later christened the William D. Davies Memorial Building. The park was renamed in honor of Farnsworth in 1939.It was placed on the Register in 1997 for its significance as a recreation and architecture site.

The Woodbury–Story House is a National Register of Historic Places structure (site #93001463) in Altadena, California. It was placed on the Register in 1993 for its significance as an example of Italianate and Colonial Revival architecture styles and its association with Capt. Frederick Woodbury, one of the founders of Altadena.

Pacific Electric Railway Company Substation No. 8, also known as the Altadena Substation, is a former traction substation in Altadena, California. It operated under the Pacific Electric Railway and served as the substation for Pasadena area lines.

Altadena (pronunciation) ("Alta", Spanish for "Upper", and "dena" from Pasadena) is an unincorporated area and census-designated place in the Verdugo Mountains region of Los Angeles County, California, approximately 14 miles (23 km) from the downtown Los Angeles Civic Center, and directly north of the city of Pasadena, California. The population was 42,777 at the 2010 census, up from 42,610 at the 2000 census.

Christmas Tree Lane (Italian: Via dell'Albero di Natale) is a 0.7-mile (1.1 km) boulevard of deodar cedar trees in Altadena, California. The trees on the Lane, Santa Rosa Avenue, have been lighted annually as a Christmas Holiday display since 1920. The association that runs it claims it is "the oldest large-scale outdoor Christmas display in the world". Christmas Tree Lane was listed on the U.S. National Register of Historic Places in 1990, the same year it was also designated as California Historical Landmark No. 990.

Masjid Al-Taqwa was a mosque located in Altadena, California, United States. It was located on Lake Ave across from the Eliot Arts Magnet Academy. Founded as a historical African American masjid, the mosque became more multicultural in subsequent decades. Its origins date back to the 1970s. It was the first mosque in the Pasadena-Altadena area. The building was destroyed by the Eaton Fire in early January 2025. It began as a meeting place for members of the Nation of Islam in the 1970s but became a multicultural Islamic center in the following decades.

The Andrew McNally House in Altadena, California was the home of Andrew McNally (1838–1904), co-founder and president of the Rand McNally publishing company. The Queen Anne Style house is listed in the National Register of Historic Places. McNally was an Irish immigrant who worked as a printer. When he came to the United States, he first worked for the Chicago Tribune when he met William Rand. Together they formed the company that bears their names. In 1880, McNally took his fortune and family and moved west They lived for a time in Pasadena, California before building their mansion in Altadena in 1887. The mansion is located on East Mariposa Street at Santa Rosa Avenue. McNally was a booster of the life in Altadena, and he convinced his friends to move here as well. They also built mansions along Mariposa, which soon began to be known locally as "Millionaire's Row". McNally paid Pasadena architect Frederick Roehrig $15,000 to design the Victorian house. Facing south, away from the street, the house offered vistas of the Los Angeles Basin, the Pacific Ocean, and Santa Catalina Island. The house has a three-story rotunda that allows a view to the San Gabriel Mountains to the north. McNally also built a private rail spur from Altadena Junction to his property to store his private railroad car. The grounds were lavishly landscaped, with an aviary along Mariposa St. His gardener also looked after the deodar cedars that grew along Santa Rosa Avenue. These trees became Christmas Tree Lane, which is also listed in the National Register. In 1904, McNally caught pneumonia while en route to his Windemere Ranch in La Mirada, California. (The ranch headquarters is also listed in the National Register.) He died shortly afterward. The gardens and aviary were neglected, some of the birds escaped. The property was then subdivided.

The Altadena Library District is an independent special district that serves the residents of Altadena, California, an unincorporated community north of Pasadena in the San Gabriel Valley of Los Angeles County. The district was formed in December 1926 under the provision of Sections 19600-19734 of the California Education Code. The district is supported by property taxes and governed by a locally elected Board of Library Trustees. according to a May, 2005 California State Department of Finance estimate, the District provides library services to a population of approximately 54,876 people. The system includes the main branch located at 600 E. Mariposa St., and the Bob Lucas Memorial Branch Library and Literacy Center located at 2659 Lincoln Avenue. In addition to the board and the staff, the Altadena Library has an active Friends of the Library which conducts an annual book sale and has a permanent store inside the library. The library has many special programs including summer reading programs, adult book clubs, Wi-Fi, a career center, the literacy center and a community room.

Echo Mountain is a mountain promontory of the San Gabriel Mountains, in the Angeles National Forest above Altadena, in Los Angeles County, California.