Daguerreotype
Morse met the inventor of the daguerreotype, Louis-Jacques-Mande Daguerre, in Paris in January 1839 when Daguerre's invention was announced [2]. While the daguerreotype fascinated Morse, he was concerned about how the new invention would compete with his telegraph. However, Morse's viewing of the daguerreotype alleviated his fears when he saw how revolutionary its technology was. Morse wrote a letter to his brother Sidney describing Daguerre's invention, which Sidney then published in the New-York Observer on April 20, 1839. While this was not the first report of the daguerreotype to appear in America, it was the first in-person report to appear in the United States.
Boulevard du Temple
A photograph of this street was taken in 1838 by Louis Daguerre from high in his 350-seat Diorama Building at 4, Rue Sanson, where it intersected with the Rue des Marais, and which from the rear looked out roughly southwards over the rooftops towards Boulevard du Temple (since demolished, the place where it stood is at the south side of Rue Léon Jouhaux just off the north corner of Place de la République). The image is one of the earlier Daguerreotypes (invented 1837), and it is thus believed to be the earliest surviving photograph showing a person.