Almost at the end of Via Uboldo, still on the left-hand side, one notices a bricked-up doorway bearing a line from Gerusalemme Liberata by Torquato Tasso: “Always open at entry, closed at exit.” If it were accessible, this entrance would allow us to enter a series of evocative artificial grottoes that lead, to the right, to what has been called the Temple of the Night. The chamber has a diameter of seven and a half metres, a hemispherical roof made of solid bricks, and is surrounded by eight pairs of columns and by niches which at the time probably housed statues. Deliberately oriented along the east–west axis, it once faced only open countryside; thus, at sunset the sun brushed its surface, while at the equinoxes light penetrated through two small windows, illuminating precise points inside. Like some of the structures in the adjoining park, the grottoes and the Temple of the Night were intended to astonish the guests of Ambrogio Uboldo, although it is also believed that the latter was used to celebrate Masonic initiation rites. In September 1943, weapons were hidden in the grottoes by partisans. The Temple of the Night has been the subject of careful and interesting studies by the very active Associazione Cernuschese Astrofili. Text taken from: Nel cuore di Cernusco sul Naviglio. Tre passeggiate nel centro storico by Elisabetta Ferrario and Mauro Raimondi (Book Time – Libreria del Naviglio, 2016).