To some, the event’s appeal is the opportunity it gives to visit free of charge buildings normally accessible for a fee. To others, it’s the thrill of being allowed to explore what is otherwise closed to the public. You can browse through their website to see which buildings are part of their roster this year (not all of them return every year into the program). We tried to visit the Flatiron Building but the line-up was at least one hour long so I recommend sticking to larger attractions when visiting with kids, able to welcome a bigger crowd. We headed instead to the Horse Palace within Exhibition Place and it turned out to be a great choice, especially with animal lovers. Low relief sculptured Art Deco facade and horseshoe imprints in the concrete at our feet reminded us that we were indeed at the Horse Palace. There were lots of activities and no line-ups. We had a close look at officers on their horses, we admired riders jumping around the arena and beautiful horses resting in their stall.