La Specola - Museo Astronomico

La Specola occupies the main tower of Padua’s old castle, a building once used as a prison before becoming the University of Padua’s astronomical observatory. The tower preserves historic instruments and rooms associated with the development of astronomy in the city.

Why it matters

The Venetian Senate established Padua’s observatory by decree in 1761 and selected the castle’s main tower as its site. Conversion work began in 1767 and continued for ten years; in 1777, the tower became the university’s astronomical observatory. Today the observatory forms part of the national astrophysics institute INAF. The tower’s rooms and instruments retain the character of a working scientific institution, linking the museum’s collections with the history of astronomical research in Padua.

What to notice

About eighty of the observatory’s roughly 150 historic instruments are displayed in the museum. The collection spans the mid-eighteenth to the early twentieth century and includes tools used to observe and measure the sky. Nineteenth-century changes added a third dome and a pavilion for the Mertz refractor. The tower also preserves the rooms and furnishings of the astronomers who worked there, making the building itself part of the scientific collection.

Context and history

The tower was built in 1242 under Ezzelino III da Romano and later refortified by the Carraresi. It served as a prison before its conversion to astronomy. The observatory became a centre of university research under the proposal of astronomy professor Giuseppe Toaldo, and the institute merged into INAF in 2001. Goethe recorded the panorama from the tower during his visit to Padua in 1786. The oldest part of the observatory opened as Museo La Specola in 1994, preserving the connection between scientific research and the history of its instruments.