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
Economy of Plovdiv which employs 300 high-qualified personnel. Another significant factory is Saninelli which produces cloth and has 1,400 employees. Plovdiv is the seat of one of the oldest breweries in the country, Kamenitza, founded in 1881. Currently Kamenitza is the leading national beer company with market share of 18%. The brewery is situated in the Eastern district and employs 650 workers. Due to the growing demand for business office space Business Park Plovdiv is going to be constructed in the district of Trakiya. The investment is for €68,000,000 and the future park will occupy a built area of 110,000 m². A commercial