“The Eco-museum with aquarium” is located in a heritage building built at the beginning of the 20th century. The Natural History Museum of Ruse was inaugurated on September 28, 2014. It is unique in Bulgaria due to the Danube fish aquarium on the floor. There is also a 15-meter scale model of the Orlova Chuka cave and the Ivanovski rock monastery. There is a rich collection of prehistoric mammal bones, including the lower jaw of Mamutus Romanos, the jaw of a cave bear and others, fossils of different molluscs, realistic dioramas. On the last floor is presented a model of the first railway line from Bulgaria, the Ruse-Varna route, the first map of Bulgaria and many more.