 A telephone call, which for marketing purposes is claimed to be the first transcontinental telephone call, occurred on January 25, 1915, a day timed to coincide with the Panama&ndash;Pacific International Exposition celebrations. However, the transcontinental telephone line was first completed on June 17, 1914, and successfully first voice tested in July 1914. A 1998 U.S. postage stamp commemorates the completion of the line in 1914. 

 Left to Right: U.N. Bethell, Senior Vice-President Amercian Telephone &amp;amp; Telegraph Co., presiding; Hon.&amp;nbsp;George McAneny, President Board of Alderman, New York City;&amp;nbsp;John J. Carty, Chief Engineer, American Telephone &amp;amp; Telegraph Co.;&amp;nbsp;Alexander Graham Bell,&amp;nbsp;John Purroy Mitchel, Mayor of New York; C.E. Yost, President of Nebraska Telephone Co., Omaha; Hon. William A. Prendergast, Comptroller of the City of New York In front of Dr. Bell is the replica of his original telephone. In front of Mr. Bethell is the glass case containing a piece of the wire over which Dr. Bell and Mr. Watson carried on the first telephone conversation in the world.  

Old AT&T Building

1st transcontinental telephone call

The site was formerly occupied by the Western Union Telegraph Building. The current 29-story, 422-foot-tall (129 m) building was commissioned after AT&amp;T's 1909 acquisition of Western Union. It was constructed from 1912 to 1916 under the leadership of Theodore Newton Vail, to designs by William W. Bosworth.

although one section was not completed until 1922. 

Sited over the former Western Union Building on In 1932 a long distance telephone call between the US and Europe was routed through AT&amp;T.It was the site of one end of the first transcontinental telephone call, the first intercity Picturephone call, and the first transatlantic telephone call. Though AT&amp;T's headquarters relocated to 550 Madison Avenue in 1984, 195 Broadway remains in use as an office building as of 2020.

The Greek design carried into the large lobby, clad with marble walls and floors, and containing sculptural ornament by&amp;nbsp;Paul Manship&amp;nbsp;and&amp;nbsp;Gaston Lachaise.  

&lt;p&gt;'Built in 1923 as the Headquarters for American Telephone and Telegraph&lt;/p&gt;&lt;p&gt;William Welles Bosworth, Architect'&lt;/p&gt; 

Old AT&T Building (195 Broadway)

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