The Chicago Architecture Foundation sponsors this free, behind-the-scenes peek at more than 200 mansions, clubs, churches, hotels and theaters.
This year, all of the tours will be outdoors or online.
Attend demonstrations and seminars on more than 150 breeds at Alliant Energy Center.
In the National Museum of Mexican Art and Harrison Park, families can create ofrendas (altars), eat pan de muerto, listen to musical performances and get faces painted. It's 3-8 p.m. and admission is free.