Photo of an Observatory Building at McGill College in Montreal, Quebec (1870)

  

Photo of an observatory building at McGill College (now McGill University) in Montreal, Quebec, c. 1870. A heavily renovated/expanded version of the building was demolished in 1963. Originally published as a stereoview by E. & H. T. Anthony & Company. The original caption is: "Magnetic Observatory - McGill College."

Source: J. Paul Getty Museum.

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Photo of a Group Posing in Front of the Georgetown University Astronomical Observatory in Washington DC (1850s)

 

Portrait of a group posing in front of the Georgetown University Astronomical Observatory in Washington, D.C., c. 1855-1860. What looks like a Jesuit priest wearing a straw top hat is posing at left. This is probably the earliest surviving photo of the observatory. Attributed to Titian Ramsay Peale.

Source: National Museum of American History.

Animated Stereoview of Two Boys Posing in Front of Vista Rock Tunnel and an Observatory in Central Park in New York City (1863)

Animated stereoview of two boys posing in front of Vista Rock Tunnel Bridge and observatory in Central Park in New York City, New York, 1863. By T. C. Roche.

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Two American Soldiers Keeping Watch From the Ruins of an Observatory in Montfaucon, France (1918)

Two American soldiers keeping watch from the ruins of an observatory in Montfaucon, France, October 17, 1918.

Source.