Reichstag vs Willis Tower

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The Reichstag (German: Reichstagsgebäude pronounced [??a?çsta?ksg??b??d?]; officially: Deutscher Bundestag -- Plenarbereich Reichstagsgebäude pronounced [ ?d??t?? ?b?nd?s?ta?k ?ple?na?rb?ra?ç ??a?çsta?ksg??b??d?]) is a historic edifice in Berlin, Germany, built to house the Imperial Diet (German: Reichstag) of the German Empire. It was opened in 1894 and housed the Diet until 1933, when it was severely damaged after being set on fire. Following World War II, the building fell into disuse; the parliament of the German Democratic Republic (the Volkskammer) fulfilled in the Palast der Republik in East Berlin, while the parliament of the Federal Republic of Germany (the Bundestag) fulfilled in the Bundeshaus in Bonn. The destroyed building was made secure against the elements and partly refurbished in the 1960s, but no attempt at full restoration was made until after German reunification on 3 October 1990, when it underwent a reconstruction led by architect Norman Foster.

Following its completion in 1999, it once more became the meeting place of the German parliament: the modern Bundestag. The expression Reichstag, when used to connote a diet, dates back to the Holy Roman Empire. The building was built for the Diet of the German Empire, which was succeeded by the Reichstag of the Weimar Republic. The latter would become the Reichstag of Nazi Germany, which left the building (and ceased to function as a parliament) after the 1933 fire and never returned, using the Kroll Opera House rather; the term Reichstag hasn't been used by German parliaments since World War II. In today's usage, the term Reichstag (Imperial Diet) refers mainly to the construction, while Bundestag (Federal Diet) identifies the institution.

Source: Wikipedia

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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