El Campo Santo Cemetery is one of the oldest surviving graveyards in California, established in 1849 as the Catholic burial ground for Old Town San Diego. The walled enclosure holds around 50 visible headstones from the early American period of San Diego's history — Mexican-era residents, early American settlers, and a few Chinese labourers. The inscriptions are in English, Spanish, and occasionally German.
The cemetery's curiosity is the unmarked graves under the road and sidewalk of San Diego Avenue. In 1889 the streetcar builders extended the track through the edge of the cemetery without moving the bodies; small bronze plaques now mark the locations in the pavement. The road carries traffic over the graves of people buried here in the 1850s and 1860s.
The cemetery is directly on San Diego Avenue in the heart of Old Town, a two-minute walk from the Old Town State Historic Park entrance.