From the Sears Tower to the Willis Tower, this Chicago skyscraper has dominated the skyline for half a century. With over 16,000 windows, almost 1,000 toilets, and even enough wiring to circle the planet 25 times, this tower has been a dominant feature of the Chicago skyline since 1973. The building officials say that the introduction of "Catalog" has breathed new life into the tower and made it a destination for both locals and visitors. The Skydeck's "The Ledge" also continues to attract thrill-seekers. Share your favorite memory of the Willis Tower or Chicago's skyline in the comments below! #SearsTower #WillisTower #ChicagoSkyline #Catalog #TheLedge #SkyscraperStats #VisitChicago