When was the Pentagon built?
The Pentagon
The building was designed by American architect George Bergstrom and built by contractor John McShain. Ground was broken on September 11, 1941, and the building was dedicated on January 15, 1943. General Brehon Somervell provided the major motivating power behind the project;[5] Colonel Leslie Groves was responsible for overseeing the project for the U.S. Army.
Architecture of the United States
The United States Capitol was constructed in successive stages starting in 1792. Shortly after the completion of its construction, it was partially burned by the British during the War of 1812. Its reconstruction began in 1815 and did not end until 1830. During the 1850s, the building was greatly expanded by Thomas U. Walter. In 1863, the imposing "Statue of Freedom", was placed on the top of the current (new at the time) dome.