Plovdiv region includes parts of the Upper Thracian Plain, the Rhodopes, Sredna Gora, the Sub-Balkan valleys and Stara Planina, with its highest peak Botev (2, 376m). The main rivers in the province are Maritsa, Stryama, Pyasachnik. There are numerous dams, the most important of which is Pyasachnik. Mineral springs are abundant, there are several major spa resorts- Hisarya, Narechen, Banya and minor spas at Klisura, Asenovgrad, Kuklen, Rosino, Krasnovo, Stoletovo and others. There are many natural landmarks, especially in the Central Balkan National Park, including the spectacular waterfall Raysko Praskalo, the highest in the Balkans. The province's capital is the city of Plovdiv, other towns include Karlovo, Sopot, Klisura, Kalofer, Hisarya, Saedinenie, Rakovski, Brezovo, Stamboliyski, Krichim, Perushtitsa, Sadovo, Parvomay, Asenovgrad, Laki, Katunica, Yiagodovo. Plovdiv is one of the oldest cities in Europe, a contemporary of Troy and Mycenae, and older than Rome, Carthage or Constantinople. Archaeologists have discovered fine pottery and other objects of everyday life from as early as the Neolithic Age, showing that in the end of the 7th millennium B.C there already was an established settlement there. In 4th century BC the city was a centre of a trade fair (called panegyreis). In 342 BC, it was conquered by Philip II of Macedon, the father of Alexander the Great, who renamed it Philippopolis or "the city of Philip" in his own honor. Later, it was reconquered by the Thracians who called it Pulpudeva (a translation of Philipopolis). In 72 AD it was seized by the Roman general Terentius Varo Lukulus and was incorporated into the Roman Empire, where it was called Trimontium (City of Three Hills) and served as metropolis (capital) of the province of Thrace. It gained a city status in late 1st century. Thrimontium was an important crossroad for the Roman Empire and was called "The largest and most beautiful of all cities" by Lucian. Although it was not the capital of the Province of Thrace, the city was the largest and most important centre in the province. In those times, the Via Militaris (or Via Diagonalis), the most important military road in the Balkans, passed through the city. The Roman times were a period of growth and cultural excellence. The ancient ruins tell a story of a vibrant, growing city with numerous public buildings, shrines, baths, and theatres. The city had advanced water system and sewerage. It was defended with a double wall. Many of those are still preserved and can be seen by the tourist. Today only a small part of the ancient city has been excavated. As to the economy of the province, it is of great importance. The agricultural production is intensive and efficient with high levels of irrigation. The major crops are fruit (apples, plums, pears, cherries), grapes, melons and watermelons, vegetables (tomatoes, peppers, carrots, cabbage, potatoes), wheat, rice, barley and others. Industry is very well developed: ferrous metallurgy near Plovdiv; thriving electronics industry in Plovdiv, Saedinenie, Voivodinovo, Radinovo and other villages in the area; agricultural machinery (tractors) in Karlovo, weapon and military plants in Sopot, Karlovo, Plovdiv; chemical industry in Plovdiv, Asenovgrad; food industry is developed almost everywhere, most notably in Plovdiv and Asenovgrad (wines). Tourism is a growing industry with the rich cultural heritage of the province and the numerous mineral springs which are of international importance.