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
History of Plovdiv In that period the richer citizens constructed houses, many of which can still be seen in the Architectural reserve "Old Plovdiv". The city was the capital of Rumelia Province between 1364–1864, and of Edirne province between 1864–1878 under Ottoman Rule. Plovdiv played a role in the struggle for Church independence. Plovdiv became the center of that struggle with leaders such as Nayden Gerov, Dr Valkovich, and Joakim Gruev. In 1836 the first Bulgarian school was inaugurated and in 1850 modern secular education began with the St Cyril and Methodius school. On 11 May 1858 the city celebrated the saints' day