Plovdiv 40,000 objects. The Museum of Natural Science was inaugurated in 1955 in the old edifice of the Plovdiv Municipality built in 1880. It is among the most important museums in the country with rich collections in its Paleontology, Mineralogy, and Botanic sections. There are several rooms for wildlife and it contains Bulgaria's largest freshwater aquarium with 40 fish species. It has a collection of minerals from the Rhodope mountains. The Museum of Aviation was established on 21 September 1991 on the territory of the Krumovo airbase to the southeast of the city. The museum possesses 59 aircraft and indoor and
Economy of Plovdiv which employs 300 high-qualified personnel. Another significant factory is Saninelli which produces cloth and has 1,400 employees. Plovdiv is the seat of one of the oldest breweries in the country, Kamenitza, founded in 1881. Currently Kamenitza is the leading national beer company with market share of 18%. The brewery is situated in the Eastern district and employs 650 workers. Due to the growing demand for business office space Business Park Plovdiv is going to be constructed in the district of Trakiya. The investment is for €68,000,000 and the future park will occupy a built area of 110,000 m². A commercial