To learn about one of the most secret – or most discreet – organisations in the world, visit the recently opened Museu Maçónico Português. You’ll discover the symbols and meaning of all the spaces and tools used at freemason meetings. At the Grémio Lusitano, the second oldest headquarters in Europe, you’ll find a historic archive recounting the last 150 years of Portuguese freemasonry. Learn about the layout of the rooms and what the pillars and tiles on the floor symbolise. You’ll also get to know about the aprons, books and crockery used. You probably won’t learn about all of the organisation’s secret and complex rituals, but you’ll certainly get a better idea about this very unique group.