The Real Milwaukee team gets a sneak peek at Historic Milwaukee’s second annual Doors Open Milwaukee. It's an opportunity for you to explore Milwaukee from the inside out the weekend of September 22 & 23. Visit over 125 buildings downtown and beyond, and take your pick of 43 In-Depth walking tours! What’s more it’s all free! Start your tour at any building. Go to City Hall for In-Depth walking tour tickets (first come, first served). No ”passport” necessary for anything.