There is – or was – a sort of rule that h was not aspirated (pronounced) in words where the stress was not on the first syllable, with the article an being used before words such as historical. Google Ngram Viewer suggests that this is not done now and that we can safely say that the well-known trio of heir, honour and hour (plus their derivative forms) are the only words with silent initial h.
Nevertheless, on 6 May 2005 the BBC reported:
Tony Blair is heading for an historic third term in government but with a greatly reduced majority.
I have a special interest in hotel. My father (born 1920) always spoke of an hotel, justifying this because it was a French loan word. Here I can see how unusual this was.