National monuments are protected areas of land or historic sites designated by the government for their cultural, historical, or natural significance. These areas are typically managed by federal agencies such as the National Park Service or the Bureau of Land Management. National monuments can include landmarks, buildings, archaeological sites, or natural features such as mountains, forests, or canyons. They are set aside for preservation and public enjoyment, and may have restrictions on activities such as mining, logging, or hunting. National monuments are important for conservation, education, and the preservation of cultural heritage.