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 institution outside the United States, the American College of Sofia, was founded in Plovdiv in 1860 and later moved to Sofia. On 5 September 2014, Plovdiv was selected as the Bulgarian host of the European Capital of Culture 2019. This happened with the help of the Municipal Foundation "Plovdiv 2019″, a non-government organization, which was established in 2011 by Plovdiv's City Council whose main objectives were to develop and to prepare Plovdiv's bid book for European Capital of Culture in 2019. Plovdiv was given various names throughout its long history. The Odrysian capital "Odryssa" () is suggested to have been