San Diego Haunted Photo gallery Pioneer Park. Located at 1521 Washington Pl San Diego, CA 92103. Formerly a 19th century cemetery now a park featuring tree-shaded lawns & paths. A row of tombstones featuring early significant San Diegans makes up a monument honoring the park as a former cemetery. Only a few graves were exhumed and entombed elsewhere. The majority of human bodies remain under the lush green park grass.