The hotel which inspired the series - the Glen Eagles - became an attraction for tourists and even had its own brown sign! Sadly, it was demolished recently to make way for a block of flats. Some talented friends of mine - The Moonstone Theatre Company - give themed evenings in pubs and restaurants, based on "Fawlty Towers", "'Allo, 'Allo", etc., but they've been banned from performing the former by John Cleese unless they pay huge performing fees.
http://www.moonstonetheatrecompany.co.uk