|Collection(s)||The building was raised between 1910 and 1911, to function as a water feed castle for the town. It has a diameter of about 12 m and a total height of almost 25 m, and four storeys (ground floor and three upper floors). The building has sheltered the museum since 1981. In 1982 the permanent exhibition opened, and in 1984 a Planetarium projector was received. The basic astronomic exhibition occupies six halls (1st and 2nd floors). The performances hall of the Planetarium is on the last floor. There is also a 15 sq.m. hall for temporary exhibitions, and on the ground floor a specialized books exhibition.
The theme of the permanent exhibition, reorganised in 1992, is "The Universe - from the Earth to the Stars". Each hall is dedicated to a special topic: Hall 1: "The Universe"; Hall 2: "Astral Families"; Hall 3: "The Sun and the Moon"; Hall 4: "The Stars"; Hall 5: "Astral Evolution"; Hall 6: "Astronomy in Our Country".
The Observatory has been rehabilitated and reopened on May 31, 2016, being equipped with new digital projectors in the planetarium hall named after astronomer Matthew Alexescu as well as five centers, complementing the permanent exhibition, with electronic information. Two of them are equipped with 3D monitors, and three of them with touchscreens. A point of astronomical observations with a powerful telescope and opening dome was also opened to the public, located above the building.
Terrace building is equipped with two binoculars that allow visitors to admire the panoramic view and observe the main objectives of Bacau city and its surroundings.|