how can i earn money if i own an website?

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Can you tell me some methods? I own an website, and i`m not pretty sure what method should i apply to earn some money with that website. I`m not having too much traffic, but i`m working at that. I have at least 20 unique visits/day without doing something, that means they come from google, yahoo, msn, and so on. My rank on alexa it`s 3.900.000 . Last month i was on 12.000.000 .I think it`s pretty good. I`m on the second page at google if you search : "most beautiful castles in europe " you`ll find my site on 4th possition i think. it`s that one with utanito on the adress. Can you please tell me how can i earn some money?