California has 19 national monuments, the most of any state in the U.S. And more than half of its monuments were proclaimed more than 90 years after the establishment of the Antiquities Act in 1906. The act was signed by President Theodore Roosevelt to protect natural, cultural and historic sites, giving presidents the authority to establish national monuments or expand existing ones by proclamation on existing federal land without approval from Congress.
• See related: Biden expands San Gabriel Mountains National Monument, adds forest rangers, funding
May 6, 1907 – Lassen Peak and Cinder Cone National Monument
Jan. 9, 1908 – Muir Woods National Monument
Jan. 16, 1908 – Pinnacles National Monument
July 16, 1911 – Devils Postpile National Monument
Jan. 16, 1913 – Cabrillo National Monument
Nov. 21, 1925 – Lava Beds National Monument
Feb. 11, 1933 – Death Valley National Monument
Aug. 10, 1936 – Joshua Tree National Monument
April 26, 1938 – Channel Islands National Monument
Jan. 11, 2000 – California Coastal National Monument
April 15, 2000 – Sequoia National Monument
Jan. 17, 2001 – Carrizo Plain National Monument
April 20, 2012 – Fort Ord National Monument
Oct. 8, 2012 – Cesar E. Chavez National Monument
Oct. 10, 2014 – San Gabriel Mountains National Monument
July 10, 2015 – Berryessa Snow Mountain National Monument
Feb. 12, 2016 – Mojave Trails National Monument
Feb. 12, 2016 – Sand to Snow National Monument
Feb. 12, 2016 – Castle Mountains National Monument
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