While Los Angeles is not exactly what you'd call a commuter's paradise, there was once a time when it boasted a pretty impressive subway system... and the memories of those long-dead railway lines still linger within these ominous empty tunnels.
In our ongoing look at eerie abandoned locations, we came across this chilling gallery by photographer Alissa Walker, originally posted on her blog Gelatobaby and compiled by Business Insider.
Walker explored these dark, crumbling tunnels, which supported the Pacific Electric Red Car and Los Angeles Railway Yellow Car lines from the late 1800s all the way to the 1960s, and documented the tour in detail.
Most of these structures are relatively intact, but half a century of abandonment has obviously taken its toll, and they're now closed to tourists due to safety concerns.
You can learn more about Walker's L.A. subway tour at her blog Gelatobaby, which also includes some cool archival images.