Its eeriest incarnation by far, the dwelling was once the meeting place of the Freemasons, a fraternal organisation that traces back to the 17th century. It has secret passwords and rituals, with integrity, friendship, respect and service as its guiding principles. Famous Freemasons include Winston Churchill and Oscar Wilde.
Members ascend the ranks, from Apprentice to Journeyman and finally to Master Mason. A 'Lodge' is where each group holds meetings, events and initiation ceremonies for new recruits. These occasions were once shrouded in secrecy, so people would have been wondering what went on behind these grand double doors.