Manni,
Aspects of it are, however, at least here in the U.S. our Lodges are clearly marked and identified, and we make no secret of the work we do for our communities, charities, etc.
Sadly, there have been places and times when they've been hunted down and persecuted,imprisoned, and even killed out-right. Ergo the reasons for secrecy in many aspects of it.
Warren