Colorado is a proper noun (n) in the sentence "If you visited southwestern Colorado, you would find there Mesa Verde National Park."
What do you mean by a concrete noun?
Although various schools of thought and science may contest the premise, most people accept that something exists. Concrete nouns denote physical things that can, at least in theory. Be perceived by at least one sense (e.g., a rock, a tree, or the universe) (for instance, a chair, apple, Janet, or atom). Conversely, abstract nouns denote abstract items, such as thoughts or notions (such as justice or hatred). While sometimes mutually exclusive, some nouns have both concrete and abstract meanings. Take the word art, which typically refers to a concept (e.g., Art is an important component of human culture) but in some situations can also refer to a specific piece of art.
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