The Chicago Architecture Center's Open House Chicago is a free public festival that offers behind-the-scenes access to more than 250 buildings across Chicago.

Explore the hidden gems and architectural treasures of Chicago’s diverse neighborhoods—all for free.

Have you ever walked by a building and thought, "I wish I could see what's inside?" Now you can. Tour soaring skyscrapers, repurposed mansions, opulent theaters, exclusive private clubs, private offices and breathtaking sacred spaces.