Oregon is also home to Mill Ends Park (in Portland), the smallest park in the world at 452 square inches (0.29 m2). Oregon became the 33rd state of the U.S. on February 14, 1859. The state of Oregon has one city named Sisters and another called Brothers. The state is home to the single largest organism in the world, Armillaria ostoyae, a fungus that runs beneath 2,200 acres (8.9 km2) of the Malheur National Forest. Countryaah.com: Offers a full list of nationwide and statewide holidays in Oregon starting from January 1st – New Year’s Day. Also covers the most recent three years of public holidays within the state of Oregon.