We came, and stood waiting upon the starting point of a path that they had set out for us. A bearded man portioned the larger than expected crowd into manageable units of 25, and each unit was released into the tour pattern every 20 minutes- or precisely every third of an hour.
This is the Grand Lodge of Masons, on 24th street in Manhattan, which was visited as part of the Open House New York event in 2009 (and to be absolutely clear, I’m not a Mason).