Which iconic structure is located in the city of Detroit?

The Detroit Renaissance Center is an iconic structure located in the city of Detroit and serves as a significant landmark in the region. This multi-towered complex, situated along the waterfront of the Detroit River, is not only distinctive in design but also functions as a hub for business and commerce in Detroit. It was developed during the 1970s and represents an important symbol of urban revitalization. With its recognizable cylindrical towers and prominent location, the Renaissance Center embodies the city's modern architectural landscape and its historical significance as a center for industry and innovation.

In contrast, the Gateway Arch is found in St. Louis, Missouri, the Willis Tower is located in Chicago, Illinois, and the Space Needle is a well-known structure in Seattle, Washington. Each of these options pertains to different cities and thus does not reflect Detroit's unique architectural identity.