Southern California's only major WWII coastal defense installation fired 1,400+ anti-aircraft rounds in the 1942 'Battle of Los Angeles' — and the battery corridors have not gone quiet since.
3601 S Gaffey St, San Pedro, CA 90731
Research updated June 2026
Age
All Ages
Cost
$
Museum admission; see website for current pricing and open days
Access
Limited Access
Concrete battery corridors, some with low clearance and uneven surfaces; significant walking required
Equipment
Photos OK
Est. 1914 · WWII Coastal Defense Headquarters · 1942 Battle of Los Angeles · Battery Osgood-Farley — 16-inch Guns · Cold War Military History
The Army selected the Point Fermin bluff at San Pedro for a coastal defense installation in 1914, recognizing its commanding view of the approaches to Los Angeles and Long Beach harbors. Construction of Battery Osgood and Battery Farley — massive reinforced concrete gun emplacements designed to house 16-inch rifles capable of striking targets well offshore — began in 1916 and continued through the early 1920s. The installation was designated Fort MacArthur in 1917, named for Lieutenant General Arthur MacArthur Jr., father of the more famous Douglas MacArthur.
By World War II, Fort MacArthur served as the headquarters for the Southern California sector of coastal defense. The Army positioned searchlights and anti-aircraft batteries throughout the Los Angeles basin and along the coastline, with Fort MacArthur as the command center for the region's defenses.
On the night of February 24–25, 1942, radar and observer reports of an unidentified aerial object moving through the Los Angeles basin triggered the region's air defense network. Fort MacArthur's anti-aircraft units and batteries throughout the city began firing. The action lasted for approximately an hour. When it was over, the Army counted roughly 1,430 rounds of anti-aircraft ammunition expended against a target that was never identified, never photographed clearly enough for analysis, and never explained in official records. No enemy aircraft were confirmed. Three civilians died of heart attacks during the incident; five more died in traffic accidents during the blackout. The 'Battle of Los Angeles,' as the press immediately labeled it, became one of the most discussed unresolved incidents of the Pacific war.
Fort MacArthur continued as an active military installation through the Cold War, operating radar and communications facilities. It was decommissioned in phases in the 1970s. The Fort MacArthur Museum Association opened a museum in the surviving battery structures in 1982. The underground corridors of Batteries Osgood-Farley are a primary feature of the museum tour.
Sources
Fort MacArthur Museum's paranormal reputation is concentrated in the underground infrastructure — the battery corridors, magazine chambers, and connecting passages that run beneath the gun emplacements. These spaces are physically distinctive: low concrete ceilings, near-total darkness away from emergency lighting, and acoustics that carry sounds from a distance in ways that can be disorienting.
Museum staff and long-term volunteers describe footsteps in the corridor sections that are closed to visitors during operating hours — measured, deliberate steps heard from adjacent sections while the museum is otherwise occupied. The phenomenon is reported on specific sections of the Battery Osgood-Farley tunnel circuit, not throughout the facility indiscriminately.
The clanking of machinery in sections where no machinery is currently operational is the second most consistent report. Former installation equipment — winches, shell hoists, mechanical elements of the gun operation — was removed after decommissioning, but accounts describe sounds that match the mechanical signatures of those systems from sections of the magazine where nothing mechanical remains.
Visitors in the narrowest tunnel sections report physical contact — the sensation of something brushing past them or pressing against their arm or shoulder — when no one else is in that section of the passage. These contact reports are more subjective than the auditory accounts but appear in visitor reviews and investigation notes with enough frequency to note.
Ghost Adventures filmed an episode at Fort MacArthur Museum in 2014 (IMDB: tt3633920), which increased the site's visibility in the paranormal investigation community and brought additional investigator teams to the facility. The battery corridors have been the primary focus of these investigations. No anomalous findings from any investigation have been independently verified, but the consistency of the auditory reports across decades of museum operation — predating the television exposure — is worth noting.
Media Appearances
Guided and self-guided tours of the Fort MacArthur Museum, including the restored gun batteries, underground magazines, and exhibits covering the fort's history from establishment in 1914 through WWII and the Cold War. The battery corridors where paranormal activity is most reported are on the standard tour circuit.
Every HauntBound history is researched from documented sources. We clearly separate verified historical fact from paranormal folklore.
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