Florence Duomo vs Pentagon

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Florence Cathedral, officially the Cattedrale di Santa Maria del Fiore (Italian pronunciation: [katte?dra?le di ?santa ma?ri?a del ?fjo?re]; in English'Cathedral of Saint Mary of the Flower'), is the cathedral of Florence, Italy (Italian: Duomo di Firenze). It was started in 1296 in the Gothic style to a style of Arnolfo di Cambio and was structurally completed by 1436, with the dome engineered by Filippo Brunelleschi. The outside of the basilica is confronted with polychrome marble panels in various shades of pink and green, bordered by white, and contains an elaborate 19th-century Gothic Revival façade by Emilio De Fabris.

The cathedral complex, in Piazza del Duomo, comprises the Baptistery and Giotto's Campanile. These three buildings are part of the UNESCO World Heritage Website covering the historic centre of Florence and are a significant tourist attraction of Tuscany. The basilica is one of Italy's largest churches, and before the development of new structural materials in the modern era, the dome was the biggest in the world. It remains the biggest brick dome ever constructed. The cathedral is the mother church of the Roman Catholic Archdiocese of Florence, whose archbishop is Giuseppe Betori.

Source: Wikipedia

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The Pentagon is the headquarters building of the United States Department of Defense.

As a symbol of the U.S. military, the phrase The Pentagon is also often used as a metonym for the Department of Defense and its leadership. Located in Arlington County, Virginia, across the Potomac River from Washington, D.C., the building was designed by American architect George Bergstrom and constructed by contractor John McShain. Ground was broken on 11 September 1941, and the building was dedicated on 15 January 1943. General Brehon Somervell supplied the important motivating power behind the project; Colonel Leslie Groves was responsible for overseeing the project for the U.S. Army. The Pentagon is the world's largest office building, with about 6,500,000 sq feet (600,000 m2) of space, of which 3,700,000 sq feet (340,000 m2) are used as offices. Some 23,000 military and civilian employees, and another 3,000 non-defense support employees, work in the Pentagon. It has five sides, five floors above ground, two basement levels, and five ring corridors per floor with a total of 17.5 mi (28.2 km) of corridors. The fundamental five-acre (20,000 m2) pentagonal plaza is nicknamed'ground zero' on the presumption that it would be a prime target in a nuclear war.On 11 September 2001, exactly 60 years after the building's construction began, American Airlines Flight 77 was hijacked and flown into the western side of the building, killing 189 people (59 victims and the five terrorists on board the airliner, as well as 125 victims in the building), according to the 9/11 Commission Report. It was the first major foreign attack on Washington's governmental facilities since the town was burned by the British during the War of 1812. The Pentagon is listed on the National Register of Historic Places and is a National Historic Landmark.

Source: Wikipedia