They are considered cultural landmarks because of all the Natural Resources in the national park and of all the different organisms that live there. Also because they are important parts in the city or state that it is in.
Because sometimes thay leave stuff behind from the past
There are No National Parks in Nebraska. There are 20 National Historic Landmarks in Nebraska; including Homestead in Beatrice and Scotts Bluff in Gering. To find out more about the 20 National Historic Landmarks in Nebraska, go to Wikipedia.com and Look up National Parks (USA).
monuments , national parks , important places
Rhode Island is one of the states where there are no national parks. It does, however, have several places that are preserved American landmarks.
Because sometimes thay leave stuff behind from the past
U.S. national parks are managed by the National Park Service, which is a federal agency in the Department of the Interior. The National Parks' land is owned by the U.S. Government, and they are indeed part of the U.S.
There are a variety of national landmarks which are popular vacation locations. Some examples include the Grand Canyon, Yellowstone National Park, and Yosemite National Park.
California doesn't have one designated state monument; it does, however, have 138 national historic landmarks, 35 national natural landmarks, and 25 national parks. But if I had to pick one to be the official state monument, it'd be a toss-up between the Hollywood sign and Cinderella's Castle at Disneyland.
It is generalizing but the Great Plains are by definition flat and plain and thus considered "boring" and not where great natural beauty or other is located. They thus do not have many National Parks. Montana and South Dakota do have National Parks though.
Washington DC is the national capital so it is natural to put national monuments in the capital. The city was literally designed out of a swampy land to be the location for national focus. In the 50 states there are national monuments, parks, federal parks, and historical sites.
Yes, some national parks and monuments are within urban areas.
The Montane Cordillera ecozone, with 7 national parks, has the most national parks.