Photo essay: Cities test—and improve upon—50 bold urban innovations

October 20, 2021

In June, the Bloomberg Philanthropies Global Mayors Challenge announced its 50 finalists, or Champion Cities, representing the boldest urban innovations to emerge from the pandemic. Now, these cities are prototyping their ideas with residents, business owners, and other stakeholders before submitting their final applications. Here, our team of Bloomberg Cities photographers shows how these tests are making innovative ideas even better.