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 the Kapitan Raycho Street, Forum in Trakiya, Excelsior, and others. Plovdiv has three large shopping centers: the €40 million Mall of Plovdiv (opened 2009) with a shopping area of , 11 cinema halls, and parking for 700 cars; Markovo tepe Mall (opened 2016); and Galeria Mall which is 6 stories high with 127 000 m area, half of which is the parking lot and the rest is shopping area. Due to high demand for business office space, new office and commercial buildings have been built. Several hypermarkets have been built mainly on the outskirts of the city: Metro, Kaufland, Triumf,