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
Plovdiv European mosque outside Moorish Spain. The Sephardic Plovdiv Synagogue is at Tsar Kaloyan Street 13 in the remnants of a small courtyard in what was once a large Jewish quarter. Dating to the 19th century, it is one of the best-preserved examples of the so-called "Ottoman-style" synagogues in the Balkans. According to author Ruth E. Gruber, the interior of the Plovdiv Synagogue is a "hidden treasure…a glorious, if run-down, burst of color." An exquisite Venetian glass chandelier hangs from the center of the ceiling, which has a richly painted dome. All surfaces are covered in elaborate, Moorish-style, geometric designs in