Historian Tim Samuelson and building manager Bradley Borowiec on the rooftop of the Wrigley Building on Oct. 19, 2021. The Michigan Avenue building is celebrating its 100th birthday this year.
The Wrigley Building and its neighbor the Tribune Tower on Oct. 19, 2021.
The clock tower on the Wrigley Building in Chicago.
The Wrigley Building on Oct. 19, 2021.
The walkway between sections of the Wrigley Building.
The Wrigley Building’s clock tower on Oct. 19, 2021.
Ornate detailing on the Wrigley Building.
Ornate detailing on the highest points of the Wrigley Building.
An ornate elevator in the Wrigley Building.
A Chicago flag on the Wrigley Building.
A view underneath the 14th-floor walkway between sections of the Wrigley Building.
The Wrigley Building on Oct. 19, 2021, which is celebrating its 100th birthday this year.
Views from the rooftop of the Wrigley Building on Oct. 19, 2021 which is celebrating its 100th birthday this year.
Michigan Avenue from the rooftop of the Wrigley Building on Oct. 19, 2021.
Views from the rooftop of the Wrigley Building on Oct. 19, 2021, which is celebrating its 100th birthday this year.
A view of the Wrigley Building and Chicago skyline from the 31st floor of Tribune Tower on June 7, 2018.
Morning shadows created by people passing the Wrigley Building on Oct. 13, 2017.
A view of the Wrigley Building and Chicago skyline from the 31st floor of Tribune Tower on June 7, 2018.
The Wrigley Building is reflected in the Chicago River on Jan. 14, 2016.
A person rides a bicycle beside the Wrigley Building on Michigan Avenue in Chicago on June 10, 2021.
Tulips on Michigan Avenue with the Wrigley Building and Trump Tower in the backdrop in Chicago on April 27, 2020.
The 14th-floor bridge connecting the two towers of Chicago’s Wrigley Building on Feb. 23, 2015.
With the Wrigley Building in the background, people cross Michigan Avenue in downtown Chicago as a light rain falls on Feb. 5, 2019.
The Tribune Tower, Wrigley Building and Chicago skyline from the Trump Tower on April 20, 2017.
The Wrigley Building is seen framed by other iconic buildings such as the Prudential Building, right, on Aug. 19, 2019.
A view looking out from the 30th floor of the Tribune Tower, home of the Chicago Tribune, looking southwest toward the Wrigley Building and the Chicago River.
A large oversized American flag hangs from the Wrigley Building as people make their way across the DuSable Bridge on Sept. 10, 2021.
The Wrigley Building along Michigan Avenue on June 18, 2020.
Flowing steam and fog envelope the Wrigley Building on North Michigan Avenue following a day of freezing rain and cold temperatures in Chicago on Feb. 20, 2019.
