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Which is correct--"a historical building" or "an historical building"?
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Comments  
In modern usage, the "h" is not silent in words like "historical" and "hotel", so it should be "a". You only need "an" when the next word starts with a vowel sound because the consonant is silent - e.g. "an honest man" or "an honourable man".

Some older people would still say, "an 'otel" or "an 'istorical building".

Cheers

John.
 hitchhiker's reply was promoted to an answer.