Milwaukee's City Hall was constructed in 1895 and was the tallest building in Milwaukee until the First Wisconsin Center was built in 1973. That building is now the U.S. Bank Center. To tour the bell tower, you will need a free ticket that must be booked online in advanced at doorsopenmilwaukee.org.John Mattrisch | JMKE Photography
Northwestern Mutual Tower and Commons is Milwaukee's first "significant" building of this century. The top-floor of the tower offers sweeping views of the city and Lake Michigan, providing some of the most unique photo opportunities of Milwaukee.JMKE Photography
One of the most iconic buildings south of downtown Milwaukee, the Basilica of St. Josaphat was made from materials of the demolished Chicago Federal Building. The Roman Catholic parish remains a testament to the faith of Polish immigrants who built it between 1896 and 1901.JMKE Photography
Constructed in the 1890s, the Federal Courthouse on East Wisconsin Avenue is a Richardson Romanesque Revival. There will be various tours offered on Saturday. It's been noted that security may take 30-45 minutes to get through.John Mattrisch
The Grain Exchange in the Mackie Building was home to the largest wheat market for trading, exporting and inspecting grain, in the early years of commerce in Milwaukee. It's now a lavish event space with over 10,000 sq. feet of space showcasing the architecture and high ceilings.
The Milwaukee Public Library opened to the public in 1898 as a Neo-Renaissance style building with an intricately carved limestone facade. On Saturday, Doors Open visitors can view the Green Roof and 4th floor offices that previously housed the Milwaukee Public Museum. On Sunday, tours of the rotunda dome and the Old Board Room will be available. Photographer: Kenneth C. Zirkel
The Tripoli Shrine Center was built in 1928 to mimic the Taj Mahal in India. The history and details of the center's interior design landed the Center on the National Register of Historic Places in 1986.
Did you know your favorite lip balm, Carmex, is made in Franklin? Did you also know they built the world's largest theater pipe organ in the world? You can tour their distribution center and listen to the organ on Saturday only.
Built in 1893, the lavish hotel was billed the "Grand Hotel of the West" because it featured fireproofing, electricity throughout and individual thermostats in each room. The Pfister has seen major renovations throughout the years without losing its original charm and elegance. Kanwar Sandu
Milwaukee Blacksmith is currently in the former Navy building at Nordberg. Visitors will step back in time to when ironworkers used hand hammers and other tools to create iron work. There will be demos by Milwaukee Blacksmith family members and apprentices.
Trek up to River Hills for the Lynden Sculpture Garden. The 40-acre park features over 50 monumental sculptures intermingled with nature.
Take in a beautiful view of Milwaukee from Veterans Park's Community Sailing Center. Learn of sailing courses, community outreach programs and find out more information on facility rentals as you overlook Lake Michigan.