1. Devils Tower: I want to write about the Devils tower because it seems like a interesting monument. It rises dramatically 1,267 feet above the ground around it. Also the summit is 5,112 feet above sea level. The Monument's boundary is an area of 1,347 acres. In Lakota, it means Mato Tipila, which, in English, means Bear Lodge. Scientists conclude that it was formed by the intrusion of igneous material. The Devils Tower was the first declared United States National Monument, on September 24, 1906, by President Theodore Roosevelt. The name, Devil's Tower, originated in 1875 during an expedition led by Col. Richard Irving Dodge, when his interpreter misinterpreted the name to mean Bad God's Tower. Later it was shortened to Devil's Tower. In the recent about 1% of the Monument's 400,000 annual visitors, climb Devils Tower. They mostly climb it through traditional climbing techniques.
2. Craters of the Moon: My second choice is the Craters of the Moon. At average elevation, it is 5,900 feet above sea level. The area's features are volcanic and represent one of the best preserved flood basalt areas in the United States. The Monument and Preserve include three major lava fields and about 400 square miles of sagebrush steppe grasslands to cover a total area of 1,117 square miles. Early white pioneers who looked for gold, affordable farm land to raise crops, or cheap ranch land for cattle also avoided the lava fields and considered them useless.
3. Gila Cliff Dwellings: My third choice is the Gila Cliff Dwellings. It is 533-acre and was established by executive proclamation on November 16, 1907, by President Theodore Roosevelt . It is located in the southern part of Catron County. The cliff was created by volcanic activity. The cliff contains the ruins of the cave dwellings built in five cliff alcoves by the Mongolian peoples. People of the Mongolian culture lived in these cliff dwellings from between 1275 AD and 1300 AD. Archaeologists have identified 46 rooms in the five caves, and believed they were occupied by 10-15 families. They do not know why the dwellings were abandoned.
I put the links to different pages in case you don't know what they are.