"One World Trade Center, World Trade Center Site, Ground Zero, Manhattan, New York, United States, North America"

Chicago skyline and Lake Michigan, view from John Hancock Center, Chicago, Illinois, United States of America

"National September 11 Memorial, Four World Trade Center at the rear, Manhattan, New York City, New York, United States, North America"

Civic Center Cultural Complex, Denver, Colorado, USA, PublicGround, North America

Modern high-rise buildings at the Civic Center Park, Denver, Colorado, USA, North America

"General Motors headquarters and the Detroit Marriott Hotel in the Renaissance Center with the Noguchi Fountain in Hart Plaza in the foreground, Detroit, Michigan, United States, North America"

"The Coleman A. Young Municipal Building, which houses courts and local government offices, in front of the One Detroit Center, the tallest office tower in Michigan, Detroit, Michigan, United States, North America"

Denver Public Library, detail view of facade, Civic Center Cultural Complex, Denver, Colorado, USA, PublicGround, North America

American flag in front of One World Trade Center, WTC, architect David Childs, at Ground Zero, Manhattan, New York City, United States, North America

Modern facades of the Museum Residences, residential buildings in the Civic Center Cultural Complex, with a granite sculpture at the front, Denver, Colorado, USA, PublicGround, North America

"Denver's historic Union Station, Denver, Colorado"

"Library, modern architecture, Civic Center, Denver, Colorado, Western United States, United States of America, North America"