This weekend's 'Doors Open Milwaukee' offers a sneak peek to the city's rich history of architecture & neighborhoods

MILWAUKEE (CBS 58) -- If it's the fourth weekend in September, you know it's time for "Doors Open Milwaukee."

This year, you can see more than 130 buildings, each special in their own way, for free.

In addition, some of the highlighted stops require tickets at a cost. Plus there's an app you can download providing self-guided tours.

Either way you look at it, organizers say the event is a great way to showcase the Cream City's architectural history and neighborhoods. "Doors Open" runs both this Saturday and Sunday from 10 a.m. until 5 p.m.

Click here to see all the locations on display this year.