CHICAGO, UNITED STATES - OCTOBER 20: People are seen at “Skydeck Ledge”, which is located on the 103rd floor of Willis Tower, second-tallest in United States, in Chicago, IL, USA on October 20, 2016. More than 1.700 people visit the “Skydeck Ledge” each year and they can see far over the plains of Illinois and across Lake Michigan to Indiana, Michigan and Wisconsin on a clear day from the Skydeck Ledge. ( Bilgin S. Şaşmaz - Anadolu Agency )
CHICAGO, UNITED STATES - OCTOBER 20: A woman is seen at “Skydeck Ledge”, which is located on the 103rd floor of Willis Tower, second-tallest in United States, in Chicago, IL, USA on October 20, 2016. More than 1.700 people visit the “Skydeck Ledge” each year and they can see far over the plains of Illinois and across Lake Michigan to Indiana, Michigan and Wisconsin on a clear day from the Skydeck Ledge. ( Bilgin S. Şaşmaz - Anadolu Agency )
CHICAGO, UNITED STATES - OCTOBER 20: A view from the “Skydeck Ledge”, which is located on the 103rd floor of Willis Tower, second-tallest in United States, in Chicago, IL, USA on October 20, 2016. More than 1.700 people visit the “Skydeck Ledge” each year and they can see far over the plains of Illinois and across Lake Michigan to Indiana, Michigan and Wisconsin on a clear day from the Skydeck Ledge. ( Bilgin S. Şaşmaz - Anadolu Agency )
CHICAGO, UNITED STATES - OCTOBER 20: A woman is seen at “Skydeck Ledge”, which is located on the 103rd floor of Willis Tower, second-tallest in United States, in Chicago, IL, USA on October 20, 2016. More than 1.700 people visit the “Skydeck Ledge” each year and they can see far over the plains of Illinois and across Lake Michigan to Indiana, Michigan and Wisconsin on a clear day from the Skydeck Ledge. ( Bilgin S. Şaşmaz - Anadolu Agency )
CHICAGO, UNITED STATES - OCTOBER 20: A woman is seen at “Skydeck Ledge”, which is located on the 103rd floor of Willis Tower, second-tallest in United States, in Chicago, IL, USA on October 20, 2016. More than 1.700 people visit the “Skydeck Ledge” each year and they can see far over the plains of Illinois and across Lake Michigan to Indiana, Michigan and Wisconsin on a clear day from the Skydeck Ledge. ( Bilgin S. Şaşmaz - Anadolu Agency )
CHICAGO, UNITED STATES - OCTOBER 20: A boy is seen at “Skydeck Ledge”, which is located on the 103rd floor of Willis Tower, second-tallest in United States, in Chicago, IL, USA on October 20, 2016. More than 1.700 people visit the “Skydeck Ledge” each year and they can see far over the plains of Illinois and across Lake Michigan to Indiana, Michigan and Wisconsin on a clear day from the Skydeck Ledge. ( Bilgin S. Şaşmaz - Anadolu Agency )
CHICAGO, UNITED STATES - OCTOBER 20: A girl is seen at “Skydeck Ledge”, which is located on the 103rd floor of Willis Tower, second-tallest in United States, in Chicago, IL, USA on October 20, 2016. More than 1.700 people visit the “Skydeck Ledge” each year and they can see far over the plains of Illinois and across Lake Michigan to Indiana, Michigan and Wisconsin on a clear day from the Skydeck Ledge. ( Bilgin S. Şaşmaz - Anadolu Agency )
CHICAGO, UNITED STATES - OCTOBER 20: People are seen at “Skydeck Ledge”, which is located on the 103rd floor of Willis Tower, second-tallest in United States, in Chicago, IL, USA on October 20, 2016. More than 1.700 people visit the “Skydeck Ledge” each year and they can see far over the plains of Illinois and across Lake Michigan to Indiana, Michigan and Wisconsin on a clear day from the Skydeck Ledge. ( Bilgin S. Şaşmaz - Anadolu Agency )