As you already know, Kansas is home to several gorgeous natural attractions, such as the Monument Rocks, Konza Prairie and Tallgrass Prairie National Preserve---but did you know that it is also home to several impressive man-made wonders, including:

1. Keeper of the Plains (Wichita)

In the early 1970s, the impressive 44 ft.-tall steel sculpture was commissioned by the city for the U.S. bicentennial and sculpted by Kiowa-Comanche artist Blackbear Bosin. He has stood guard over the Arkansas and Little Arkansas Rivers since 1974 and is one of the tallest statues in the country.

2. El Quartelejo Ruins (Scott City)

Located in Lake Scott State Park, the El Quartelejo Ruins are thought to have been built in the late 1600s by a tribe of Pueblo Indians after escaping the rule of Spanish immigrants in New Mexico. El Quartelejo was designated a National Historic Landmark in 1964.

3. World's Largest Ball of Twine (Cawker City)

The massive 19,973 lb., 41 ft.-wide ball (which, if unwound, would reach 7,801,766 ft.) was originally created by a single Cawker City resident and has been added onto by community members since his death in 1974.

4. Mennonite Settler (Newton)

The beautiful 17 ft.-tall limestone statue pays tribute to the hardworking Mennonites, with the base description reading, "Commemorating entry into Kansas from Russia of Turkey Red Hard Wheat by Mennonites 1874." It was listed on the National Register of Historic Places in 1998.

5. Davis Memorial (Hiawatha)

The gorgeous, albeit haunting memorial was carved entirely of Italian marble by John Milburn Davis after his wife's passing in 1930. The tribute was added to the National Register of Historic Places in 1977.

6. Coronado Heights (Lindsborg)

Who says you have to travel to Europe to see a castle? The stone Coronado Heights was built in 1934 as a reference point of where Francisco Vásquez de Coronado gave up his search for the seven cities of gold.

7. Rosedale World War I Memorial Arch (Kansas City)

Dedicated to the men of Kansas City's Rosedale neighborhood who fought in WWI, the Rosedale World War I Memorial Arch was added to the National Register of Historic Places in 1977.

8. The Big Well (Greensburg)

Sure, you have to go inside the Museum to see the Well, but it's "well" worth it to see the impressive 109 ft.-deep, 32 ft.-wide hand-dug well.

9. Madonna of the Trail (Council Grove)

Located in historic Council Grove, the gorgeous statue is one of 12 throughout the United States that pays tribute to the spirit of pioneer women. The monuments were originally commissioned by the National Society of Daughters of the American Revolution.

10. Tri-State Marker

The original stone monument was built in 1938 as a way to mark the meeting of the Kansas, Oklahoma, and Missouri borders. Since then, however, it has been discovered that the actual tri-state point lies 50 feet southeast of the original marking, resulting in the Missouri Department of Natural Resources placing a newer, more modern looking plaque in its place.

11. Norman No. 1 Oil Well (Neodesha)

The now abandoned oil well signifies the beginning of development of the Mid-Continent oil field and earned a spot on the National Register of Historic Places in 1974.

12. Rainbow Bridge (Baxter Springs)

What was once a heavy traffic area along the legendary Route 66 is now a small, quiet bridge that stretches out over Brush Creek. The Bridge was added to the NRHP in 1983.

Which man-made marvel do you find to be the most impressive? Let us know in the comments!