Many places around the Sooner State have qualified to be on the National Register of Historic Places - an official list of the U.S. government that includes buildings, sites, parks or any object or structure believed to be worthy of preservation. We found 12 places to visit in Oklahoma on the National Register of Historic Places that are beautiful, historical and worthy of a visit. Check them out:

1. Henry Lassen House, El Reno

The Henry Lassen House was built sometime between 1889 and 1895. It is a three-story Neoclassical-style home that was purchased by a prominent resident of El Reno, Henry Lassen, in 1898. It was placed on the National Register of Historic Places in 2008 and is located at 605 S. Hoff El Reno, Oklahoma.

2. Carnegie Library, Guthrie

Built in 1901, the Guthrie Carnegie library was the 2nd Carnegie-funded library in Oklahoma and is the oldest one left standing in the state. It was listed on the National Register of Historic Places in 1971 and is located at 406 East Oklahoma Avenue, Guthrie, Oklahoma.

3. Sacred Heart, Pottawatomie County

Originally name Sacred Heart Mission, the now-ghost town began in the late 1800s. The most notable structure left is the Sacred Heart Catholic Church that was built in 1914. The site was listed on the National Register of Historic Places in 1983 and is located in Pottawatomie County.

4. State Highway No. 78 Bridge at the Red River (Oklahoma - Texas)

Located between Oklahoma and Texas over the Red River, this 7-span through truss bridge was built during the Great Depression. The total length of the bridge is 2,108.0 ft. The bridge was listed on the National Register of Historic Places in 1996.

5. Seminary Hall at Northeastern State University, Tahlequah

Seminary Hall was built in 1889 and stands as the centerpiece at Northeastern State University in Tahlequah. It is the oldest building on the campus of NSU and was completely revamped in 1994. It was added to the National Register of Historic Places in 1973.

6. Chilocco Indian Agricultural School, Newkirk

The Chilocco School was built for Native Americans and operated between 1884-1980. In 1882 Congress authorized five non-reservation boarding schools and Chilocco was one of the five.The school closed in 1980 when government funding ceased. In 2011 Chilicco closed to the public. The school was placed on the National Register of Historic Places in 2006.

7. Lake Murray State Park, Carter County

As Oklahoma's oldest and largest state park, Lake Murray State Park gets over 1.7 million visitors a year. The park was built between 1935-1941 and was the first state park in the state listed on the National Register of Historic Places in 2001.

8. Arcadia Round Barn, Arcadia

This iconic Route 66 landmark was built in 1898 and for a time became the most photographed landmark on the Mother Road. The barn was restored in 1992 and is still America's only true round barn. It was listed on the National Register of Historic Places in 1977.

9. Boston Avenue Methodist Church, Tulsa

Built in 1929 in downtown Tulsa, the Boston Avenue Methodist Church became one of the greatest examples of ecclesiastical Art Deco architecture in the country. This stunning building was placed on the National Register of Historic Places in 1978 and became a National Historic Landmark in 1999.

10. Rock Mary, Hinton

Rock Mary was a distinguished landmark along the California Road in Caddo County. It was named after a prominent physician's daughter, Mary Conway, on their journey out of Oklahoma to California in 1849. The rock is now located on private property but visitors can schedule a visit with the Hinton Historical Museum. Rock Mary was placed on the National Register of Historic Places in 1970.

11. Frank Phillips Home, Bartlesville

The home was built in 1909 by oil-tycoon Frank Phillips in Bartlesville. Until his death in 1950, the Phillip's family life was centered around this home. The home (more like a mansion) consists of 26 rooms and was donated to the Oklahoma Historical Society in 1973. The home was then put on the National Register of Historic Places in 1975 and is located at 1107 SE Cherokee Avenue

Bartlesville, Oklahoma.

12. Oklahoma City National Memorial, Oklahoma City

Built in 1997 as a memorial to honor those who lost their lives and were affected by the Oklahoma City bombing in 1995. The memorial began construction and was put on the National Register of Historic Places in 1997.

Check out these 15 Historical Landmarks In Oklahoma for more great places to visit.