Which is correct--"a historical building" or "an historical building"?
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".


 hitchhiker's reply was promoted to an answer.