Aerial survey · USDA NAIP · public domainA demolished 1918 lumber magnate's mansion on 107 Altadena acres, where the Marx Brothers once owned the land and hikers now report blue lights, screams, and the sensation of being followed.
5400 N Lake Ave, Altadena, CA 91001
Research updated June 2026
Age
All Ages
Cost
Free
Free public access. Trailhead is at the gate on Lake Avenue at the foot of the San Gabriel Mountains.
Access
Limited Access
Steep, uneven dirt trails ascending into the San Gabriel Mountains. Not wheelchair accessible.
Equipment
Photos OK
Est. 1918 · Altadena History · Marx Brothers Property · Angeles National Forest · Historic Estate Site
Charles Cobb made his fortune in the Oregon lumber industry before relocating to Southern California and commissioning a grand mansion on 107 acres in the Altadena foothills in 1918. The property sat at the base of the San Gabriel Mountains on land that had previously hosted a failed gold mining operation — one of many small-scale mining claims that dotted the mountain slopes during the late 19th century. Cobb lived at the estate until his death in 1939 with no reported disturbances.
The estate changed hands several times in the following decades. The Pasadena Freemasons purchased it as a retirement community. After that arrangement ended, the Sisters of St. Joseph used the property as a religious retreat. In 1957, the Marx Brothers — the famous comedy troupe — acquired the land as a real estate investment. Their plans for the site included rezoning it as a private cemetery, a proposal that did not receive approval. The mansion was demolished in 1959. The Marx Brothers eventually sold, and the upper acreage was incorporated into the Angeles National Forest.
The lower trailhead area at Lake Avenue and Loma Alta Drive remains public open space. The former estate grounds are now forested hillside crisscrossed by hiking trails. No mansion remains — only stone foundations and the general topography of the original property.
Sources
The Cobb Estate's haunted reputation built gradually after the mansion's demolition, accelerating with internet-era ghost hunting culture in the 1990s and 2000s. The most consistently reported phenomena are blue lights seen in the forest at night — not flashlight beams or headlights, but lights described as stationary and sourceless, hovering at mid-height. Explanations offered over the years include will-o'-the-wisps, bioluminescent organisms, and atmospheric light effects, none of which has been conclusively demonstrated.
The screams and screeches reported by hikers are more contested. The San Gabriel Mountains host mountain lions and great horned owls; both produce vocalizations that can alarm unfamiliar visitors. Whether any reported screaming exceeds what those animals explain is not documented in primary sources.
The feeling of being followed is the most common reported experience, mentioned in numerous hiker accounts and hiking forums. It is also the least verifiable — a subjective sensation in a heavily forested environment at night.
A paranormal investigation group called Los Angeles Most Haunted conducted an EMF sweep of the property and documented what they described as significant detector readings. The group's investigation methodology and equipment calibration are not independently reviewed. The estate's association with the KKK, which appears in some urban legend accounts, is not substantiated by the historical sources that have been found.
A free public hike through the forested hillside where Charles Cobb's 107-acre estate once stood. The mansion was demolished in 1959; only foundations and landscape remnants remain. Trails ascend into the San Gabriel Mountains foothills above the site. Night hikes are popular and legal on public land, though trails are unlit.
Every HauntBound history is researched from documented sources. We clearly separate verified historical fact from paranormal folklore.
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