Observatory of the rue Serpente - Credit: Wikimedia Commons
The Observatory of the rue Serpente was an astronomical observatory owned and operated by the Société Astronomique de France (the French Astronomical Society) in the historic Latin Quarter of Paris. It operated between 1890 until 1968, when it was transferred to a new location at the nearby Astronomy Tower of the Sorbonne. Read more on Wikipedia
Source: en.wikipedia.org