Willis Tower vs Cologne Cathedral

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The Willis Tower (formerly and informally: Sears Tower, its title until 2009) is a 110-story, 1,450-foot (442.1 m) skyscraper in Chicago. At completion in 1973, it surpassed the World Trade Center in New York City to become the tallest building in the world, a title that it held for nearly 25 years; it was also the tallest building in the Western Hemisphere for 41 years, before the new One World Trade Center surpassed it in 2013. While it held the title of'Tallest Office Building' before 2013, it dropped the title of'Tallest Man-Made Construction' after only 3 decades. The CN Tower in Toronto, which functions as a communications tower, took over the title in 1976. The Willis Tower is considered a seminal accomplishment for engineer Fazlur Rahman Khan. It is currently the third-tallest construction in the USA and the Western hemisphere -- and the 23rd-tallest in the world.

Annually, several million people visit its observation deck, the highest in the USA, which makes it one of Chicago's most popular tourist destinations. The arrangement was renamed in 2009 by the Willis Group as a term of its lease. As of April 2018, the building's largest tenant is United Airlines, which moved its corporate headquarters in 77 West Wacker Drive (then the United Building) in 2012, occupying around 20 flooring. Other major tenants include the building's namesake Willis Towers Watson and law firms Schiff Hardin and Seyfarth Shaw. Morgan Stanley plans to move into the construction in 2019 and become its fourth-largest tenant by 2020.

Source: Wikipedia

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<p>Cologne Cathedral (German: Kölner Dom, Formally Hohe Domkirche Sankt Petrus, English: Cathedral Church of Saint Peter) is a Catholic cathedral in Cologne, North Rhine-Westphalia, Germany. </p>It is the seat of the Archbishop of Cologne and of the government of the Archdiocese of Cologne. It is a monument of architecture and German Catholicism and was declared a World Heritage Site in 1996. It is Germany's most visited landmark, bringing an average of 20,000 people every day. In 157 m (515 ft), the cathedral is now the tallest twin-spired church on earth, the 2nd largest church in Europe after Ulm Minster, and the third largest church in the world. It contains the second-tallest spires and is the largest Gothic church in Northern Europe. The cathedral is given the of any church in the world by the towers for both spires that are huge. The choir has the largest height to width ratio, 3.6:1, of any medieval church.Construction of Cologne Cathedral started in 1248 but was stopped in 1473, unfinished. Work did not restart until the 1840s, and the edifice was completed to its original plan in 1880. Cologne's medieval builders had planned a grand structure to house the reliquary of the 3 Kings and fit its function as a place of worship for the Holy Roman Emperor. Despite having been left incomplete during the medieval period, Cologne Cathedral eventually became unified as"a masterpiece of exceptional intrinsic value" and"a powerful testimony to the strength and persistence of Christian belief in medieval and modern Europe".

Source: Wikipedia