Architecturally, each detail had been perfected. Even the elevators were specifically designed to move along all three axes (they most closer together as the elevator moves up, moving closer to the center, and moving up). They move at a 7.5 degree angle. Maybe these are intended to create the shape of the compass?
The building had lots of artwork and historical artifacts about George Washington and the various branches of Masonry. The kids were especially impressed with the suits of armor of the Knights Templar.