Which is correct--"a historical building" or "an historical building"? I asked the same question anonymously but have since signed in. Please send me an e-mail with the correct information.
A hotel, an hotel? <- I got it wrong
For what I know, ' a ' is correct.
Site Hint: Check out our list of pronunciation videos.
"a" is correct

From Aaron, Jane E. "The Little Brown Compact Handbook." Harper Collins: New York, 1995.
p. 295.

"Use 'a' before words beginning with consonant sounds, including those spelled with an initial pronounced "h" and those spelled with vowels that are sounded as consonants: "a historian," "a one-o'clock class," Use an before words that begin with vowel sounds, including those spelled with an initial silent "h:" "an orgy," "an L," "an honor."
 hitchhiker's reply was promoted to an answer.