In the Peña Adobe Park is the historical site on the northern trail of Peña Adobe Park. Pena Adobe Cemetery is a historic graveyard. Peña Adobe Cemetery has been moved a few times. For some years it was disrepair. From 1917 to 1920 the 30,000-square-foot graveyard had about 389 wooden marked graves abandoned and the site used for sheep grazing by rancher, William B. O’Connor who had bought the land. The graves were moved in May 1966. The old Cemetery in Peña Adobe Park is a 38°20′20″N122°00′46″W / 38.33888°N 122.01269°W / 38.33888; -122.01269[14]
Jack Hume Grove
In the Peña Adobe Park is the Historical Jack Hume Grove named after William Jack and Charles Hume built in 1850. Jack Hume Grove grew crops on the land. In 1897 a railroad line was built at Jack Hume Grove to move his crops to San Francisco for sell. Jack Hume Grove grew fruit, vegetables and nuts. The site if Jack Hume Grove is on the northern trail of Peña Adobe Park at 38°20′24″N122°00′38″W / 38.33988°N 122.010694°W / 38.33988; -122.010694 .[15]