Plovdiv of which are high. Because of these hills, Plovdiv is often referred to in Bulgaria as "The City of the Seven Hills". Plovdiv is host to a huge variety of cultural events such as the International Fair Plovdiv, the international theatrical festival "A stage on a crossroad", the TV festival "The golden chest", and many more novel festivals, such as Night/Plovdiv in September, Kapana Fest, and Opera Open. There are many preserved ruins such as the ancient Plovdiv Roman theatre, a Roman odeon, a Roman aqueduct, the Plovdiv Roman Stadium, the archaeological complex Eirene, and others. The oldest American educational
Plovdiv in Silistra Eyalet between 1593 and 1826, the sanjak centre in Eyalet of Adrianople between 1826 and1867 and the sanjak centre of Edirne Vilayet between 1867 and 1878. During that period Plovdiv was a major economic center along with Constantinople, Edirne, and Thessaloniki. The richer citizens constructed beautiful houses many of which can still be seen in the Architectural reserve Old Plovdiv. Under the rule of the Ottoman Empire, Filibe (as the city was known at that time) was a focal point for the Bulgarian national movement and survived as one of the major cultural centers for Bulgarian culture and