Swing dancing floors

Over the weekend while swing dancing, I experienced a new type of dance floor, a homemade one made out of particle board and a 2x4 studs. The venue was along the Ottawa River at Britannia Park which is close to where I live. The forecast for the weekend was a 60% chance of thunderstorms so the organizers opted to hold the dancing under a tent and to build an impromptu dance floor which was bouncy in some places and stiff as a board in others. Midway through the afternoon Alaina, one of the local dance instructors, came out with a 10lb bag of corn meal and poured it all of the dance floor. The floor suddenly became very slippery which made for a new dancing experience. There was a side benefits as little kids saw the corn meal as a play toy and made piles and figures out of it while their parents were dancing nearby. This got me thinking about the other two dance floors that I regularly dance on. The Ottawa Swing dance society moved in the spring to a social hall attached to an old church which has a sprung floor. I really like the floor as it hall a nice give. OSDS's previous home was a community centre which had a parquet which sat on a cement pad which was hard on your back and knees after a while. I wondering what other dance floors are out there.